65724531 has 4 divisors (see below), whose sum is σ = 87632712. Its totient is φ = 43816352.

The previous prime is 65724523. The next prime is 65724559. The reversal of 65724531 is 13542756.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65724531 - 2³ = 65724523 is a prime.

It is a super-2 number, since 2×65724531² = 8639427950339922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65724492 and 65724501.

It is not an unprimeable number, because it can be changed into a prime (65724031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10954086 + ... + 10954091.

It is an arithmetic number, because the mean of its divisors is an integer number (21908178).

Almost surely, 2^65724531 is an apocalyptic number.

65724531 is a deficient number, since it is larger than the sum of its proper divisors (21908181).

65724531 is a wasteful number, since it uses less digits than its factorization.

65724531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21908180.

The product of its digits is 25200, while the sum is 33.

The square root of 65724531 is about 8107.0667321788. The cubic root of 65724531 is about 403.5609774425.

The spelling of 65724531 in words is "sixty-five million, seven hundred twenty-four thousand, five hundred thirty-one".