31881274865 has 64 divisors (see below), whose sum is σ = 44423735040. Its totient is φ = 21721789440.

The previous prime is 31881274847. The next prime is 31881274897. The reversal of 31881274865 is 56847218813.

It is not a de Polignac number, because 31881274865 - 2⁶ = 31881274801 is a prime.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 52008299 + ... + 52008911.

It is an arithmetic number, because the mean of its divisors is an integer number (694120860).

Almost surely, 2^31881274865 is an apocalyptic number.

It is an amenable number.

31881274865 is a deficient number, since it is larger than the sum of its proper divisors (12542460175).

31881274865 is a wasteful number, since it uses less digits than its factorization.

31881274865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122.

The product of its digits is 2580480, while the sum is 53.

The spelling of 31881274865 in words is "thirty-one billion, eight hundred eighty-one million, two hundred seventy-four thousand, eight hundred sixty-five".