31885890329 has 2 divisors, whose sum is σ = 31885890330. Its totient is φ = 31885890328.

The previous prime is 31885890301. The next prime is 31885890349. The reversal of 31885890329 is 92309858813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28451930329 + 3433960000 = 168677^2 + 58600^2 .

It is a cyclic number.

It is not a de Polignac number, because 31885890329 - 2²⁰ = 31884841753 is a prime.

It is not a weakly prime, because it can be changed into another prime (31885890349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15942945164 + 15942945165.

It is an arithmetic number, because the mean of its divisors is an integer number (15942945165).

Almost surely, 2^31885890329 is an apocalyptic number.

It is an amenable number.

31885890329 is a deficient number, since it is larger than the sum of its proper divisors (1).

31885890329 is an equidigital number, since it uses as much as digits as its factorization.

31885890329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 31885890329 in words is "thirty-one billion, eight hundred eighty-five million, eight hundred ninety thousand, three hundred twenty-nine".