31343393131 has 2 divisors, whose sum is σ = 31343393132. Its totient is φ = 31343393130.

The previous prime is 31343393113. The next prime is 31343393161. The reversal of 31343393131 is 13139334313.

Together with previous prime (31343393113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31343393131 is a prime.

It is a super-2 number, since 2×31343393131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31343393161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671696565 + 15671696566.

It is an arithmetic number, because the mean of its divisors is an integer number (15671696566).

Almost surely, 2^31343393131 is an apocalyptic number.

31343393131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343393131 is an equidigital number, since it uses as much as digits as its factorization.

31343393131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 34.

The spelling of 31343393131 in words is "thirty-one billion, three hundred forty-three million, three hundred ninety-three thousand, one hundred thirty-one".