111212312131 has 2 divisors, whose sum is σ = 111212312132. Its totient is φ = 111212312130.

The previous prime is 111212312063. The next prime is 111212312161. The reversal of 111212312131 is 131213212111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111212312131 is a prime.

It is a super-2 number, since 2×111212312131² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111212312099 and 111212312108.

It is not a weakly prime, because it can be changed into another prime (111212312161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606156065 + 55606156066.

It is an arithmetic number, because the mean of its divisors is an integer number (55606156066).

Almost surely, 2^111212312131 is an apocalyptic number.

111212312131 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212312131 is an equidigital number, since it uses as much as digits as its factorization.

111212312131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 111212312131 its reverse (131213212111), we get a palindrome (242425524242).

The spelling of 111212312131 in words is "one hundred eleven billion, two hundred twelve million, three hundred twelve thousand, one hundred thirty-one".