65612431 has 4 divisors (see below), whose sum is σ = 65887200. Its totient is φ = 65337664.

The previous prime is 65612419. The next prime is 65612447. The reversal of 65612431 is 13421656.

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 65612431 - 2¹⁷ = 65481359 is a prime.

It is a super-2 number, since 2×65612431² = 8609982203459522, which contains 22 as substring.

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 65612431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65612411) 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, 137026 + ... + 137503.

It is an arithmetic number, because the mean of its divisors is an integer number (16471800).

Almost surely, 2^65612431 is an apocalyptic number.

65612431 is a deficient number, since it is larger than the sum of its proper divisors (274769).

65612431 is a wasteful number, since it uses less digits than its factorization.

65612431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274768.

The product of its digits is 4320, while the sum is 28.

The square root of 65612431 is about 8100.1500603384. The cubic root of 65612431 is about 403.3314085163.

The spelling of 65612431 in words is "sixty-five million, six hundred twelve thousand, four hundred thirty-one".