1312937691 has 16 divisors (see below), whose sum is σ = 1887486720. Its totient is φ = 807000480.

The previous prime is 1312937687. The next prime is 1312937707. The reversal of 1312937691 is 1967392131.

It is not a de Polignac number, because 1312937691 - 2² = 1312937687 is a prime.

It is a super-2 number, since 2×1312937691² = 3447610760896822962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312937611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13906 + ... + 53096.

It is an arithmetic number, because the mean of its divisors is an integer number (117967920).

Almost surely, 2^1312937691 is an apocalyptic number.

1312937691 is a deficient number, since it is larger than the sum of its proper divisors (574549029).

1312937691 is a wasteful number, since it uses less digits than its factorization.

1312937691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40066.

The product of its digits is 61236, while the sum is 42.

The square root of 1312937691 is about 36234.4820716400. The cubic root of 1312937691 is about 1095.0014778654.

The spelling of 1312937691 in words is "one billion, three hundred twelve million, nine hundred thirty-seven thousand, six hundred ninety-one".