31138137 has 12 divisors (see below), whose sum is σ = 45048640. Its totient is φ = 20725848.

The previous prime is 31138117. The next prime is 31138153. The reversal of 31138137 is 73183113.

It is not a de Polignac number, because 31138137 - 2⁶ = 31138073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31138137.

It is not an unprimeable number, because it can be changed into a prime (31138117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4164 + ... + 8922.

Almost surely, 2^31138137 is an apocalyptic number.

It is an amenable number.

31138137 is a deficient number, since it is larger than the sum of its proper divisors (13910503).

31138137 is a wasteful number, since it uses less digits than its factorization.

31138137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5492 (or 5489 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 31138137 is about 5580.1556429906. The cubic root of 31138137 is about 314.6039770010.

The spelling of 31138137 in words is "thirty-one million, one hundred thirty-eight thousand, one hundred thirty-seven".