The Number

81

Eighty-One

In Base 31 Untrigesimal Is

2j31

The numbers with a 31 subscript use Base 31 Untrigesimal notation.

For more familiar numbers: See Eighty-One in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

78
2g31
Seventy-Eight in Base 31 Untrigesimal
79
2h31
Seventy-Nine in Base 31 Untrigesimal
80
2i31
Eighty in Base 31 Untrigesimal
82
2k31
Eighty-Two in Base 31 Untrigesimal
83
2l31
Eighty-Three in Base 31 Untrigesimal
84
2m31
Eighty-Four in Base 31 Untrigesimal

Scientific Notation

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

8.1e1

Reciprocal

A number multiplied with its reciprocal is one.

0.0bqof9hinam531

The reciprocal of 81 in Base 31 Untrigesimal.

Palindrome?

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

The number 2j31 is not a palindrome.

Not A Prime Number

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

Eighty-one is a composite number with 5 total factors (including 1 and itself).   See primes in Base 31 Untrigesimal

A Composite

Composites have more than just these two factors.

Eighty-one is a composite number with 5 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 eighty-one has the following 1 prime factor:

3
331
Three in Base 31 Untrigesimal

Prime Factorization

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

3314 = 2j31

Base Conversions

The number eighty-one in 35 different bases