1312320979 has 2 divisors, whose sum is σ = 1312320980. Its totient is φ = 1312320978.

The previous prime is 1312320973. The next prime is 1312321019. The reversal of 1312320979 is 9790232131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312320979 - 2⁷ = 1312320851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312320973) 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 as a sum of consecutive naturals, namely, 656160489 + 656160490.

It is an arithmetic number, because the mean of its divisors is an integer number (656160490).

Almost surely, 2^1312320979 is an apocalyptic number.

1312320979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312320979 is an equidigital number, since it uses as much as digits as its factorization.

1312320979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 1312320979 is about 36225.9710566880. The cubic root of 1312320979 is about 1094.8300032866.

The spelling of 1312320979 in words is "one billion, three hundred twelve million, three hundred twenty thousand, nine hundred seventy-nine".