31331321312111 has 16 divisors (see below), whose sum is σ = 31656233664000. Its totient is φ = 31008159993888.

The previous prime is 31331321312089. The next prime is 31331321312191. The reversal of 31331321312111 is 11121312313313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31331321312111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331321312191) 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, 166244150 + ... + 166432508.

It is an arithmetic number, because the mean of its divisors is an integer number (1978514604000).

Almost surely, 2^{31331321312111} is an apocalyptic number.

31331321312111 is a deficient number, since it is larger than the sum of its proper divisors (324912351889).

31331321312111 is a wasteful number, since it uses less digits than its factorization.

31331321312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192998.

The product of its digits is 972, while the sum is 26.

Adding to 31331321312111 its reverse (11121312313313), we get a palindrome (42452633625424).

The spelling of 31331321312111 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred twenty-one million, three hundred twelve thousand, one hundred eleven".