Nearby Numbers

Positive, nonzero integers within three units

28

Twenty-Eight

29

Twenty-Nine

30

Thirty

32

Thirty-Two

33

Thirty-Three

34

Thirty-Four

Scientific Notation

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

3.1e1

Reciprocal

A number multiplied with its reciprocal is one.

0.03225806451612903

The reciprocal of 31.

Palindrome?

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

The number 31 is not a palindrome.

A Prime Number

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

Thirty-one is the 11th prime number.   See primes in Base 10 Decimal

Not A Composite

Composites have more than just these two factors.

Thirty-One is not a composite number because it has exactly two factors: One and Thirty-One

Prime Factors

31

Thirty-One

Prime Factorization

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

311 = 31

Base Conversions

The number thirty-one in 35 different bases