64562591 has 2 divisors, whose sum is σ = 64562592. Its totient is φ = 64562590.

The previous prime is 64562573. The next prime is 64562599. The reversal of 64562591 is 19526546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64562591 - 2⁶ = 64562527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64562599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281295 + 32281296.

It is an arithmetic number, because the mean of its divisors is an integer number (32281296).

Almost surely, 2^64562591 is an apocalyptic number.

64562591 is a deficient number, since it is larger than the sum of its proper divisors (1).

64562591 is an equidigital number, since it uses as much as digits as its factorization.

64562591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 64562591 is about 8035.0850026618. The cubic root of 64562591 is about 401.1686469191.

It can be divided in two parts, 645 and 62591, that added together give a palindrome (63236).

The spelling of 64562591 in words is "sixty-four million, five hundred sixty-two thousand, five hundred ninety-one".