65312591 has 2 divisors, whose sum is σ = 65312592. Its totient is φ = 65312590.

The previous prime is 65312581. The next prime is 65312627. The reversal of 65312591 is 19521356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65312591 - 2²² = 61118287 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 (65312581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32656295 + 32656296.

It is an arithmetic number, because the mean of its divisors is an integer number (32656296).

Almost surely, 2^65312591 is an apocalyptic number.

65312591 is a deficient number, since it is larger than the sum of its proper divisors (1).

65312591 is an equidigital number, since it uses as much as digits as its factorization.

65312591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 65312591 is about 8081.6205676832. The cubic root of 65312591 is about 402.7160801121.

The spelling of 65312591 in words is "sixty-five million, three hundred twelve thousand, five hundred ninety-one".