1277139313 has 4 divisors (see below), whose sum is σ = 1279037668. Its totient is φ = 1275240960.

The previous prime is 1277139289. The next prime is 1277139407. The reversal of 1277139313 is 3139317721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 937400689 + 339738624 = 30617^2 + 18432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277139313 is a prime.

It is a super-2 number, since 2×1277139313² = 3262169649620223938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1277139113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948168 + ... + 949513.

It is an arithmetic number, because the mean of its divisors is an integer number (319759417).

Almost surely, 2^1277139313 is an apocalyptic number.

It is an amenable number.

1277139313 is a deficient number, since it is larger than the sum of its proper divisors (1898355).

1277139313 is an equidigital number, since it uses as much as digits as its factorization.

1277139313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898354.

The product of its digits is 23814, while the sum is 37.

The square root of 1277139313 is about 35737.0859612252. The cubic root of 1277139313 is about 1084.9575788096.

It can be divided in two parts, 127713 and 9313, that added together give a triangular number (137026 = T₅₂₃).

The spelling of 1277139313 in words is "one billion, two hundred seventy-seven million, one hundred thirty-nine thousand, three hundred thirteen".