65312491 has 2 divisors, whose sum is σ = 65312492. Its totient is φ = 65312490.

The previous prime is 65312449. The next prime is 65312497. The reversal of 65312491 is 19421356.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65312491 - 2⁹ = 65311979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65312497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32656245 + 32656246.

It is an arithmetic number, because the mean of its divisors is an integer number (32656246).

Almost surely, 2^65312491 is an apocalyptic number.

65312491 is a deficient number, since it is larger than the sum of its proper divisors (1).

65312491 is an equidigital number, since it uses as much as digits as its factorization.

65312491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 65312491 is about 8081.6143808029. The cubic root of 65312491 is about 402.7158745794.

The spelling of 65312491 in words is "sixty-five million, three hundred twelve thousand, four hundred ninety-one".