1312423979 has 2 divisors, whose sum is σ = 1312423980. Its totient is φ = 1312423978.

The previous prime is 1312423949. The next prime is 1312424017. The reversal of 1312423979 is 9793242131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312423979 - 2²⁴ = 1295646763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312423949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656211989 + 656211990.

It is an arithmetic number, because the mean of its divisors is an integer number (656211990).

Almost surely, 2^1312423979 is an apocalyptic number.

1312423979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312423979 is an equidigital number, since it uses as much as digits as its factorization.

1312423979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 1312423979 is about 36227.3926608030. The cubic root of 1312423979 is about 1094.8586458067.

The spelling of 1312423979 in words is "one billion, three hundred twelve million, four hundred twenty-three thousand, nine hundred seventy-nine".