31131433412879 has 2 divisors, whose sum is σ = 31131433412880. Its totient is φ = 31131433412878.

The previous prime is 31131433412857. The next prime is 31131433412899. The reversal of 31131433412879 is 97821433413113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31131433412879 - 2¹² = 31131433408783 is a prime.

It is a super-2 number, since 2×31131433412879² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31131433412899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565716706439 + 15565716706440.

It is an arithmetic number, because the mean of its divisors is an integer number (15565716706440).

Almost surely, 2^{31131433412879} is an apocalyptic number.

31131433412879 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131433412879 is an equidigital number, since it uses as much as digits as its factorization.

31131433412879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 31131433412879 in words is "thirty-one trillion, one hundred thirty-one billion, four hundred thirty-three million, four hundred twelve thousand, eight hundred seventy-nine".