31331544513312 has 96 divisors (see below), whose sum is σ = 83720545900992. Its totient is φ = 10257441030144.

The previous prime is 31331544513289. The next prime is 31331544513319. The reversal of 31331544513312 is 21331544513313.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (31331544513319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5059713 + ... + 9394880.

It is an arithmetic number, because the mean of its divisors is an integer number (872089019802).

Almost surely, 2^{31331544513312} is an apocalyptic number.

31331544513312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31331544513312 is an abundant number, since it is smaller than the sum of its proper divisors (52389001387680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31331544513312 is a wasteful number, since it uses less digits than its factorization.

31331544513312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14455010 (or 14455002 counting only the distinct ones).

The product of its digits is 194400, while the sum is 39.

Subtracting from 31331544513312 its reverse (21331544513313), we obtain a palindrome (9999999999999).

The spelling of 31331544513312 in words is "thirty-one trillion, three hundred thirty-one billion, five hundred forty-four million, five hundred thirteen thousand, three hundred twelve".