65531631 has 16 divisors (see below), whose sum is σ = 95546880. Its totient is φ = 39621120.

The previous prime is 65531581. The next prime is 65531633. The reversal of 65531631 is 13613556.

It is not a de Polignac number, because 65531631 - 2⁶ = 65531567 is a prime.

It is a super-2 number, since 2×65531631² = 8588789323040322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65531633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13135 + ... + 17423.

It is an arithmetic number, because the mean of its divisors is an integer number (5971680).

Almost surely, 2^65531631 is an apocalyptic number.

65531631 is a deficient number, since it is larger than the sum of its proper divisors (30015249).

65531631 is a wasteful number, since it uses less digits than its factorization.

65531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766.

The product of its digits is 8100, while the sum is 30.

The square root of 65531631 is about 8095.1609619575. The cubic root of 65531631 is about 403.1657764654.

The spelling of 65531631 in words is "sixty-five million, five hundred thirty-one thousand, six hundred thirty-one".