65731613 has 4 divisors (see below), whose sum is σ = 66369888. Its totient is φ = 65093340.

The previous prime is 65731591. The next prime is 65731619. The reversal of 65731613 is 31613756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65731613 - 2²² = 61537309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65731613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65731619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318983 + ... + 319188.

It is an arithmetic number, because the mean of its divisors is an integer number (16592472).

Almost surely, 2^65731613 is an apocalyptic number.

It is an amenable number.

65731613 is a deficient number, since it is larger than the sum of its proper divisors (638275).

65731613 is a wasteful number, since it uses less digits than its factorization.

65731613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638274.

The product of its digits is 11340, while the sum is 32.

The square root of 65731613 is about 8107.5034998451. The cubic root of 65731613 is about 403.5754718591.

The spelling of 65731613 in words is "sixty-five million, seven hundred thirty-one thousand, six hundred thirteen".