31234031357 has 2 divisors, whose sum is σ = 31234031358. Its totient is φ = 31234031356.

The previous prime is 31234031347. The next prime is 31234031399. The reversal of 31234031357 is 75313043213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30104332036 + 1129699321 = 173506^2 + 33611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31234031357 is a prime.

It is a super-2 number, since 2×31234031357² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31234031317) 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, 15617015678 + 15617015679.

It is an arithmetic number, because the mean of its divisors is an integer number (15617015679).

Almost surely, 2^31234031357 is an apocalyptic number.

It is an amenable number.

31234031357 is a deficient number, since it is larger than the sum of its proper divisors (1).

31234031357 is an equidigital number, since it uses as much as digits as its factorization.

31234031357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 32.

The spelling of 31234031357 in words is "thirty-one billion, two hundred thirty-four million, thirty-one thousand, three hundred fifty-seven".