31506790369 has 2 divisors, whose sum is σ = 31506790370. Its totient is φ = 31506790368.

The previous prime is 31506790361. The next prime is 31506790397. The reversal of 31506790369 is 96309760513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30211654225 + 1295136144 = 173815^2 + 35988^2 .

It is a cyclic number.

It is not a de Polignac number, because 31506790369 - 2³ = 31506790361 is a prime.

It is a super-2 number, since 2×31506790369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31506790361) 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, 15753395184 + 15753395185.

It is an arithmetic number, because the mean of its divisors is an integer number (15753395185).

Almost surely, 2^31506790369 is an apocalyptic number.

It is an amenable number.

31506790369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31506790369 is an equidigital number, since it uses as much as digits as its factorization.

31506790369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 49.

The spelling of 31506790369 in words is "thirty-one billion, five hundred six million, seven hundred ninety thousand, three hundred sixty-nine".