31712808961 has 4 divisors (see below), whose sum is σ = 31713505492. Its totient is φ = 31712112432.

The previous prime is 31712808923. The next prime is 31712808989. The reversal of 31712808961 is 16980821713.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1073807361 + 30639001600 = 32769^2 + 175040^2 .

It is a cyclic number.

It is not a de Polignac number, because 31712808961 - 2⁷ = 31712808833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31712805961) 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 3 ways as a sum of consecutive naturals, for example, 274806 + ... + 372751.

It is an arithmetic number, because the mean of its divisors is an integer number (7928376373).

Almost surely, 2^31712808961 is an apocalyptic number.

It is an amenable number.

31712808961 is a deficient number, since it is larger than the sum of its proper divisors (696531).

31712808961 is an equidigital number, since it uses as much as digits as its factorization.

31712808961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696530.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 31712808961 in words is "thirty-one billion, seven hundred twelve million, eight hundred eight thousand, nine hundred sixty-one".