313772521 has 2 divisors, whose sum is σ = 313772522. Its totient is φ = 313772520.

The previous prime is 313772513. The next prime is 313772533. The reversal of 313772521 is 125277313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312016896 + 1755625 = 17664^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 313772521 - 2³ = 313772513 is a prime.

It is not a weakly prime, because it can be changed into another prime (313776521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156886260 + 156886261.

It is an arithmetic number, because the mean of its divisors is an integer number (156886261).

Almost surely, 2^313772521 is an apocalyptic number.

It is an amenable number.

313772521 is a deficient number, since it is larger than the sum of its proper divisors (1).

313772521 is an equidigital number, since it uses as much as digits as its factorization.

313772521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 31.

The square root of 313772521 is about 17713.6252924126. The cubic root of 313772521 is about 679.5242642775.

The spelling of 313772521 in words is "three hundred thirteen million, seven hundred seventy-two thousand, five hundred twenty-one".