31231323311320 has 64 divisors (see below), whose sum is σ = 76660573962240. Its totient is φ = 11356567612800.

The previous prime is 31231323311299. The next prime is 31231323311339. The reversal of 31231323311320 is 2311332313213.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17627175 + ... + 19317865.

It is an arithmetic number, because the mean of its divisors is an integer number (1197821468160).

Almost surely, 2^{31231323311320} is an apocalyptic number.

It is an amenable number.

31231323311320 is an abundant number, since it is smaller than the sum of its proper divisors (45429250650920).

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

31231323311320 is a wasteful number, since it uses less digits than its factorization.

31231323311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732696 (or 1732692 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 31231323311320 its reverse (2311332313213), we get a palindrome (33542655624533).

The spelling of 31231323311320 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty-three million, three hundred eleven thousand, three hundred twenty".