1312307279 has 4 divisors (see below), whose sum is σ = 1312382184. Its totient is φ = 1312232376.

The previous prime is 1312307267. The next prime is 1312307281. The reversal of 1312307279 is 9727032131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9727032131 = 79 ⋅123126989.

It is a cyclic number.

It is not a de Polignac number, because 1312307279 - 2⁴ = 1312307263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312307879) 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, 4469 + ... + 51425.

It is an arithmetic number, because the mean of its divisors is an integer number (328095546).

Almost surely, 2^1312307279 is an apocalyptic number.

1312307279 is a deficient number, since it is larger than the sum of its proper divisors (74905).

1312307279 is an equidigital number, since it uses as much as digits as its factorization.

1312307279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74904.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 1312307279 is about 36225.7819653351. The cubic root of 1312307279 is about 1094.8261934404.

The spelling of 1312307279 in words is "one billion, three hundred twelve million, three hundred seven thousand, two hundred seventy-nine".