31290425881 has 27 divisors (see below), whose sum is σ = 37272914973. Its totient is φ = 26236473120.

The previous prime is 31290425869. The next prime is 31290425893. The reversal of 31290425881 is 18852409213.

The square root of 31290425881 is 176891.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (31290425869) and next prime (31290425893).

It can be written as a sum of positive squares in 4 ways, for example, as 469112281 + 30821313600 = 21659^2 + 175560^2 .

It is not a de Polignac number, because 31290425881 - 2²⁹ = 30753554969 is a prime.

It is a super-2 number, since 2×31290425881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31290425821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25294795 + ... + 25296031.

Almost surely, 2^31290425881 is an apocalyptic number.

31290425881 is the 176891-st square number.

31290425881 is the 88446-th centered octagonal number.

It is an amenable number.

31290425881 is a deficient number, since it is larger than the sum of its proper divisors (5982489092).

31290425881 is an equidigital number, since it uses as much as digits as its factorization.

31290425881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 31290425881 in words is "thirty-one billion, two hundred ninety million, four hundred twenty-five thousand, eight hundred eighty-one".