64518239 has 2 divisors, whose sum is σ = 64518240. Its totient is φ = 64518238.

The previous prime is 64518191. The next prime is 64518241. The reversal of 64518239 is 93281546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64518239 - 2⁸ = 64517983 is a prime.

It is a super-2 number, since 2×64518239² = 8325206327322242, which contains 22 as substring.

Together with 64518241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64518739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32259119 + 32259120.

It is an arithmetic number, because the mean of its divisors is an integer number (32259120).

Almost surely, 2^64518239 is an apocalyptic number.

64518239 is a deficient number, since it is larger than the sum of its proper divisors (1).

64518239 is an equidigital number, since it uses as much as digits as its factorization.

64518239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 64518239 is about 8032.3246323838. The cubic root of 64518239 is about 401.0767634337.

The spelling of 64518239 in words is "sixty-four million, five hundred eighteen thousand, two hundred thirty-nine".