31313131139 has 2 divisors, whose sum is σ = 31313131140. Its totient is φ = 31313131138.

The previous prime is 31313131021. The next prime is 31313131141. The reversal of 31313131139 is 93113131313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31313131139 - 2²⁰ = 31312082563 is a prime.

It is a super-2 number, since 2×31313131139² (a number of 22 digits) contains 22 as substring.

Together with 31313131141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31313131169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656565569 + 15656565570.

It is an arithmetic number, because the mean of its divisors is an integer number (15656565570).

Almost surely, 2^31313131139 is an apocalyptic number.

31313131139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313131139 is an equidigital number, since it uses as much as digits as its factorization.

31313131139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 29.

The spelling of 31313131139 in words is "thirty-one billion, three hundred thirteen million, one hundred thirty-one thousand, one hundred thirty-nine".