31138757 has 12 divisors (see below), whose sum is σ = 35188704. Its totient is φ = 27490320.

The previous prime is 31138741. The next prime is 31138763. The reversal of 31138757 is 75783113.

It is not a de Polignac number, because 31138757 - 2⁴ = 31138741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138057) 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, 119 + ... + 7892.

It is an arithmetic number, because the mean of its divisors is an integer number (2932392).

Almost surely, 2^31138757 is an apocalyptic number.

It is an amenable number.

31138757 is a deficient number, since it is larger than the sum of its proper divisors (4049947).

31138757 is a wasteful number, since it uses less digits than its factorization.

31138757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8060 (or 8047 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 31138757 is about 5580.2111967201. The cubic root of 31138757 is about 314.6060650426.

The spelling of 31138757 in words is "thirty-one million, one hundred thirty-eight thousand, seven hundred fifty-seven".