1313927257 has 2 divisors, whose sum is σ = 1313927258. Its totient is φ = 1313927256.

The previous prime is 1313927231. The next prime is 1313927291. The reversal of 1313927257 is 7527293131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213546896 + 100380361 = 34836^2 + 10019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313927257 - 2²³ = 1305538649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313627257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656963628 + 656963629.

It is an arithmetic number, because the mean of its divisors is an integer number (656963629).

Almost surely, 2^1313927257 is an apocalyptic number.

It is an amenable number.

1313927257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313927257 is an equidigital number, since it uses as much as digits as its factorization.

1313927257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 1313927257 is about 36248.1345313107. The cubic root of 1313927257 is about 1095.2765110022.

The spelling of 1313927257 in words is "one billion, three hundred thirteen million, nine hundred twenty-seven thousand, two hundred fifty-seven".