64513979 has 2 divisors, whose sum is σ = 64513980. Its totient is φ = 64513978.

The previous prime is 64513921. The next prime is 64514029. The reversal of 64513979 is 97931546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64513979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64513279) 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, 32256989 + 32256990.

It is an arithmetic number, because the mean of its divisors is an integer number (32256990).

Almost surely, 2^64513979 is an apocalyptic number.

64513979 is a deficient number, since it is larger than the sum of its proper divisors (1).

64513979 is an equidigital number, since it uses as much as digits as its factorization.

64513979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 64513979 is about 8032.0594494812. The cubic root of 64513979 is about 401.0679358286.

The spelling of 64513979 in words is "sixty-four million, five hundred thirteen thousand, nine hundred seventy-nine".