31325401631521 has 2 divisors, whose sum is σ = 31325401631522. Its totient is φ = 31325401631520.

The previous prime is 31325401631509. The next prime is 31325401631527. The reversal of 31325401631521 is 12513610452313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25538317067025 + 5787084564496 = 5053545^2 + 2405636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31325401631521 is a prime.

It is a super-3 number, since 3×31325401631521³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31325401631527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662700815760 + 15662700815761.

It is an arithmetic number, because the mean of its divisors is an integer number (15662700815761).

Almost surely, 2^{31325401631521} is an apocalyptic number.

It is an amenable number.

31325401631521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31325401631521 is an equidigital number, since it uses as much as digits as its factorization.

31325401631521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 31325401631521 in words is "thirty-one trillion, three hundred twenty-five billion, four hundred one million, six hundred thirty-one thousand, five hundred twenty-one".