1315807979 has 2 divisors, whose sum is σ = 1315807980. Its totient is φ = 1315807978.

The previous prime is 1315807937. The next prime is 1315807993. The reversal of 1315807979 is 9797085131.

It is a strong prime.

It is an emirp because it is prime and its reverse (9797085131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1315807979 - 2¹⁶ = 1315742443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315807919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657903989 + 657903990.

It is an arithmetic number, because the mean of its divisors is an integer number (657903990).

Almost surely, 2^1315807979 is an apocalyptic number.

1315807979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315807979 is an equidigital number, since it uses as much as digits as its factorization.

1315807979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 50.

The square root of 1315807979 is about 36274.0675827787. The cubic root of 1315807979 is about 1095.7988454936.

The spelling of 1315807979 in words is "one billion, three hundred fifteen million, eight hundred seven thousand, nine hundred seventy-nine".