315256621 has 2 divisors, whose sum is σ = 315256622. Its totient is φ = 315256620.

The previous prime is 315256603. The next prime is 315256631. The reversal of 315256621 is 126652513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300155625 + 15100996 = 17325^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 315256621 - 2¹¹ = 315254573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315256631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157628310 + 157628311.

It is an arithmetic number, because the mean of its divisors is an integer number (157628311).

Almost surely, 2^315256621 is an apocalyptic number.

It is an amenable number.

315256621 is a deficient number, since it is larger than the sum of its proper divisors (1).

315256621 is an equidigital number, since it uses as much as digits as its factorization.

315256621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 315256621 is about 17755.4673551557. The cubic root of 315256621 is about 680.5939310641.

The spelling of 315256621 in words is "three hundred fifteen million, two hundred fifty-six thousand, six hundred twenty-one".