315213035521 has 2 divisors, whose sum is σ = 315213035522. Its totient is φ = 315213035520.

The previous prime is 315213035519. The next prime is 315213035581. The reversal of 315213035521 is 125530312513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259875648400 + 55337387121 = 509780^2 + 235239^2 .

It is a cyclic number.

It is not a de Polignac number, because 315213035521 - 2¹ = 315213035519 is a prime.

Together with 315213035519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (315213035581) 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 as a sum of consecutive naturals, namely, 157606517760 + 157606517761.

It is an arithmetic number, because the mean of its divisors is an integer number (157606517761).

Almost surely, 2^315213035521 is an apocalyptic number.

It is an amenable number.

315213035521 is a deficient number, since it is larger than the sum of its proper divisors (1).

315213035521 is an equidigital number, since it uses as much as digits as its factorization.

315213035521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 31.

The spelling of 315213035521 in words is "three hundred fifteen billion, two hundred thirteen million, thirty-five thousand, five hundred twenty-one".