31880928911 has 4 divisors (see below), whose sum is σ = 34333308072. Its totient is φ = 29428549752.

The previous prime is 31880928907. The next prime is 31880928941. The reversal of 31880928911 is 11982908813.

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

It is a cyclic number.

It is not a de Polignac number, because 31880928911 - 2² = 31880928907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31880928911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31880928901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226189561 + ... + 1226189586.

It is an arithmetic number, because the mean of its divisors is an integer number (8583327018).

Almost surely, 2^31880928911 is an apocalyptic number.

31880928911 is a deficient number, since it is larger than the sum of its proper divisors (2452379161).

31880928911 is a wasteful number, since it uses less digits than its factorization.

31880928911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452379160.

The product of its (nonzero) digits is 248832, while the sum is 50.

The spelling of 31880928911 in words is "thirty-one billion, eight hundred eighty million, nine hundred twenty-eight thousand, nine hundred eleven".