31350842521 has 2 divisors, whose sum is σ = 31350842522. Its totient is φ = 31350842520.

The previous prime is 31350842503. The next prime is 31350842557. The reversal of 31350842521 is 12524805313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19331009296 + 12019833225 = 139036^2 + 109635^2 .

It is a cyclic number.

It is not a de Polignac number, because 31350842521 - 2¹⁵ = 31350809753 is a prime.

It is not a weakly prime, because it can be changed into another prime (31350843521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15675421260 + 15675421261.

It is an arithmetic number, because the mean of its divisors is an integer number (15675421261).

Almost surely, 2^31350842521 is an apocalyptic number.

It is an amenable number.

31350842521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31350842521 is an equidigital number, since it uses as much as digits as its factorization.

31350842521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 31350842521 in words is "thirty-one billion, three hundred fifty million, eight hundred forty-two thousand, five hundred twenty-one".