The Number

645

Six Hundred and Forty-Five

In Base 9 Nonary Is

7869

The numbers with a 9 subscript use Base 9 Nonary notation.

For more familiar numbers: See Six Hundred and Forty-Five in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

642
7839
Six Hundred and Forty-Two in Base 9 Nonary
643
7849
Six Hundred and Forty-Three in Base 9 Nonary
644
7859
Six Hundred and Forty-Four in Base 9 Nonary
646
7879
Six Hundred and Forty-Six in Base 9 Nonary
647
7889
Six Hundred and Forty-Seven in Base 9 Nonary
648
8009
Six Hundred and Forty-Eight in Base 9 Nonary

Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

6.45e2

Reciprocal

A number multiplied with its reciprocal is one.

0.001114840825320067049

The reciprocal of 645 in Base 9 Nonary.

Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 7869 is not a palindrome.

Not A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Six hundred and forty-five is a composite number with 8 total factors (including 1 and itself).   See primes in Base 9 Nonary

A Composite

Composites have more than just these two factors.

Six hundred and forty-five is a composite number with 8 total factors (including 1 and itself).

Prime Factors

The prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number six hundred and forty-five has the following 3 prime factors:

3
39
Three in Base 9 Nonary
5
59
Five in Base 9 Nonary
43
479
Forty-Three in Base 9 Nonary

Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

391 · 591 · 4791 = 7869

Base Conversions

The number six hundred and forty-five in 35 different bases