31680878521 has 8 divisors (see below), whose sum is σ = 33350286080. Its totient is φ = 30011670288.

The previous prime is 31680878441. The next prime is 31680878527. The reversal of 31680878521 is 12587808613.

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 31680878521 - 2³¹ = 29533394873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31680878527) 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, 365080 + ... + 443446.

It is an arithmetic number, because the mean of its divisors is an integer number (4168785760).

Almost surely, 2^31680878521 is an apocalyptic number.

It is an amenable number.

31680878521 is a deficient number, since it is larger than the sum of its proper divisors (1669407559).

31680878521 is a wasteful number, since it uses less digits than its factorization.

31680878521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99663.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 31680878521 in words is "thirty-one billion, six hundred eighty million, eight hundred seventy-eight thousand, five hundred twenty-one".