31131211211930 has 16 divisors (see below), whose sum is σ = 56036303622144. Its totient is φ = 12452457053520.

The previous prime is 31131211211929. The next prime is 31131211211959. The reversal of 31131211211930 is 3911211213113.

It is a super-2 number, since 2×31131211211930² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31131211211893 and 31131211211902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703399 + ... + 8072421.

It is an arithmetic number, because the mean of its divisors is an integer number (3502268976384).

Almost surely, 2^{31131211211930} is an apocalyptic number.

31131211211930 is a deficient number, since it is larger than the sum of its proper divisors (24905092410214).

31131211211930 is a wasteful number, since it uses less digits than its factorization.

31131211211930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857821.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 31131211211930 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred eleven million, two hundred eleven thousand, nine hundred thirty".