1277566313 has 2 divisors, whose sum is σ = 1277566314. Its totient is φ = 1277566312.

The previous prime is 1277566309. The next prime is 1277566333. The reversal of 1277566313 is 3136657721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977687824 + 299878489 = 31268^2 + 17317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277566313 - 2² = 1277566309 is a prime.

It is a super-2 number, since 2×1277566313² = 3264351368224827938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1277566333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638783156 + 638783157.

It is an arithmetic number, because the mean of its divisors is an integer number (638783157).

Almost surely, 2^1277566313 is an apocalyptic number.

It is an amenable number.

1277566313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277566313 is an equidigital number, since it uses as much as digits as its factorization.

1277566313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 41.

The square root of 1277566313 is about 35743.0596479932. The cubic root of 1277566313 is about 1085.0784805939.

The spelling of 1277566313 in words is "one billion, two hundred seventy-seven million, five hundred sixty-six thousand, three hundred thirteen".