31131312131 has 2 divisors, whose sum is σ = 31131312132. Its totient is φ = 31131312130.

The previous prime is 31131312097. The next prime is 31131312143. The reversal of 31131312131 is 13121313113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31131312131 - 2¹⁸ = 31131049987 is a prime.

It is a super-2 number, since 2×31131312131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31131312161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565656065 + 15565656066.

It is an arithmetic number, because the mean of its divisors is an integer number (15565656066).

Almost surely, 2^31131312131 is an apocalyptic number.

31131312131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131312131 is an equidigital number, since it uses as much as digits as its factorization.

31131312131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 20.

Adding to 31131312131 its reverse (13121313113), we get a palindrome (44252625244).

The spelling of 31131312131 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, one hundred thirty-one".