31138100 has 36 divisors (see below), whose sum is σ = 77224224. Its totient is φ = 10675680.

The previous prime is 31138091. The next prime is 31138103. The reversal of 31138100 is 183113.

It is a super-2 number, since 2×31138100² = 1939162543220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21542 + ... + 22941.

Almost surely, 2^31138100 is an apocalyptic number.

It is an amenable number.

31138100 is an abundant number, since it is smaller than the sum of its proper divisors (46086124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31138100 is a wasteful number, since it uses less digits than its factorization.

31138100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44504 (or 44497 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 31138100 is about 5580.1523276699. The cubic root of 31138100 is about 314.6038523912.

The spelling of 31138100 in words is "thirty-one million, one hundred thirty-eight thousand, one hundred".