31540343239 has 2 divisors, whose sum is σ = 31540343240. Its totient is φ = 31540343238.

The previous prime is 31540343173. The next prime is 31540343309. The reversal of 31540343239 is 93234304513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31540343239 - 2¹⁵ = 31540310471 is a prime.

It is a super-2 number, since 2×31540343239² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31540343198 and 31540343207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31540346239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770171619 + 15770171620.

It is an arithmetic number, because the mean of its divisors is an integer number (15770171620).

Almost surely, 2^31540343239 is an apocalyptic number.

31540343239 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540343239 is an equidigital number, since it uses as much as digits as its factorization.

31540343239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 37.

The spelling of 31540343239 in words is "thirty-one billion, five hundred forty million, three hundred forty-three thousand, two hundred thirty-nine".