13213979 has 2 divisors, whose sum is σ = 13213980. Its totient is φ = 13213978.

The previous prime is 13213951. The next prime is 13213999. The reversal of 13213979 is 97931231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13213979 is a prime.

It is not a weakly prime, because it can be changed into another prime (13213939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606989 + 6606990.

It is an arithmetic number, because the mean of its divisors is an integer number (6606990).

Almost surely, 2^13213979 is an apocalyptic number.

13213979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213979 is an equidigital number, since it uses as much as digits as its factorization.

13213979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 35.

The square root of 13213979 is about 3635.1037124132. The cubic root of 13213979 is about 236.4165474563.

The spelling of 13213979 in words is "thirteen million, two hundred thirteen thousand, nine hundred seventy-nine".