13578979 has 2 divisors, whose sum is σ = 13578980. Its totient is φ = 13578978.

The previous prime is 13578941. The next prime is 13579001. The reversal of 13578979 is 97987531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13578979 is a prime.

It is not a weakly prime, because it can be changed into another prime (13578919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6789489 + 6789490.

It is an arithmetic number, because the mean of its divisors is an integer number (6789490).

Almost surely, 2^13578979 is an apocalyptic number.

13578979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13578979 is an equidigital number, since it uses as much as digits as its factorization.

13578979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 13578979 is about 3684.9666212871. The cubic root of 13578979 is about 238.5735935460.

The spelling of 13578979 in words is "thirteen million, five hundred seventy-eight thousand, nine hundred seventy-nine".