31000138 has 16 divisors (see below), whose sum is σ = 50205960. Its totient is φ = 14270976.

The previous prime is 31000127. The next prime is 31000157. The reversal of 31000138 is 83100013.

It can be written as a sum of positive squares in 4 ways, for example, as 26450449 + 4549689 = 5143^2 + 2133^2 .

It is a super-2 number, since 2×31000138² = 1922017112038088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10578 + ... + 13186.

Almost surely, 2^31000138 is an apocalyptic number.

31000138 is a deficient number, since it is larger than the sum of its proper divisors (19205822).

31000138 is a wasteful number, since it uses less digits than its factorization.

31000138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31000138 is about 5567.7767555821. The cubic root of 31000138 is about 314.1385313788.

The spelling of 31000138 in words is "thirty-one million, one hundred thirty-eight", and thus it is an aban number.