31240809831 has 96 divisors (see below), whose sum is σ = 55784243200. Its totient is φ = 15178363200.

The previous prime is 31240809797. The next prime is 31240809841. The reversal of 31240809831 is 13890804213.

It is not a de Polignac number, because 31240809831 - 2¹⁸ = 31240547687 is a prime.

It is a super-2 number, since 2×31240809831² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31240809831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240809841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3809946 + ... + 3818136.

Almost surely, 2^31240809831 is an apocalyptic number.

31240809831 is a deficient number, since it is larger than the sum of its proper divisors (24543433369).

31240809831 is a wasteful number, since it uses less digits than its factorization.

31240809831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8321 (or 8310 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 31240809831 in words is "thirty-one billion, two hundred forty million, eight hundred nine thousand, eight hundred thirty-one".