315227681 has 2 divisors, whose sum is σ = 315227682. Its totient is φ = 315227680.

The previous prime is 315227657. The next prime is 315227683. The reversal of 315227681 is 186722513.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191573281 + 123654400 = 13841^2 + 11120^2 .

It is a cyclic number.

It is not a de Polignac number, because 315227681 - 2¹⁰ = 315226657 is a prime.

It is a super-2 number, since 2×315227681² = 198736981737275522, which contains 22 as substring.

Together with 315227683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (315227683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157613840 + 157613841.

It is an arithmetic number, because the mean of its divisors is an integer number (157613841).

Almost surely, 2^315227681 is an apocalyptic number.

It is an amenable number.

315227681 is a deficient number, since it is larger than the sum of its proper divisors (1).

315227681 is an equidigital number, since it uses as much as digits as its factorization.

315227681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 315227681 is about 17754.6523762083. The cubic root of 315227681 is about 680.5731046539.

The spelling of 315227681 in words is "three hundred fifteen million, two hundred twenty-seven thousand, six hundred eighty-one".