65312091 has 12 divisors (see below), whose sum is σ = 101596768. Its totient is φ = 40191984.

The previous prime is 65312087. The next prime is 65312099. The reversal of 65312091 is 19021356.

65312091 is a `hidden beast` number, since 653 + 1 + 2 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 65312091 - 2² = 65312087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65312099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278995 + ... + 279228.

Almost surely, 2^65312091 is an apocalyptic number.

65312091 is a deficient number, since it is larger than the sum of its proper divisors (36284677).

65312091 is a wasteful number, since it uses less digits than its factorization.

65312091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558242 (or 558239 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 65312091 is about 8081.5896332343. The cubic root of 65312091 is about 402.7150524463.

The spelling of 65312091 in words is "sixty-five million, three hundred twelve thousand, ninety-one".