31311040525 has 12 divisors (see below), whose sum is σ = 38831080500. Its totient is φ = 25045354880.

The previous prime is 31311040507. The next prime is 31311040583. The reversal of 31311040525 is 52504011313.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2702024361 + 28609016164 = 51981^2 + 169142^2 .

It is not a de Polignac number, because 31311040525 - 2¹⁵ = 31311007757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 31311040525.

It is a congruent number.

It is an unprimeable number.

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, 105051 + ... + 271399.

It is an arithmetic number, because the mean of its divisors is an integer number (3235923375).

Almost surely, 2^31311040525 is an apocalyptic number.

It is an amenable number.

31311040525 is a deficient number, since it is larger than the sum of its proper divisors (7520039975).

31311040525 is a wasteful number, since it uses less digits than its factorization.

31311040525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173888 (or 173883 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 31311040525 its reverse (52504011313), we get a palindrome (83815051838).

The spelling of 31311040525 in words is "thirty-one billion, three hundred eleven million, forty thousand, five hundred twenty-five".