31640463913 has 8 divisors (see below), whose sum is σ = 31825489608. Its totient is φ = 31455974784.

The previous prime is 31640463893. The next prime is 31640463917. The reversal of 31640463913 is 31936404613.

It can be written as a sum of positive squares in 4 ways, for example, as 137053849 + 31503410064 = 11707^2 + 177492^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31640463913 - 2⁹ = 31640463401 is a prime.

It is a super-2 number, since 2×31640463913² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31640463917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15556 + ... + 252037.

It is an arithmetic number, because the mean of its divisors is an integer number (3978186201).

Almost surely, 2^31640463913 is an apocalyptic number.

It is an amenable number.

31640463913 is a deficient number, since it is larger than the sum of its proper divisors (185025695).

31640463913 is a wasteful number, since it uses less digits than its factorization.

31640463913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268283.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 31640463913 in words is "thirty-one billion, six hundred forty million, four hundred sixty-three thousand, nine hundred thirteen".