1312979689 has 8 divisors (see below), whose sum is σ = 1500811200. Its totient is φ = 1125213936.

The previous prime is 1312979651. The next prime is 1312979711. The reversal of 1312979689 is 9869792131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1312979689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312979609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38682 + ... + 64204.

It is an arithmetic number, because the mean of its divisors is an integer number (187601400).

Almost surely, 2^1312979689 is an apocalyptic number.

It is an amenable number.

1312979689 is a deficient number, since it is larger than the sum of its proper divisors (187831511).

1312979689 is an equidigital number, since it uses as much as digits as its factorization.

1312979689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32879.

The product of its digits is 1469664, while the sum is 55.

The square root of 1312979689 is about 36235.0615978502. The cubic root of 1312979689 is about 1095.0131533070.

The spelling of 1312979689 in words is "one billion, three hundred twelve million, nine hundred seventy-nine thousand, six hundred eighty-nine".