65631 has 8 divisors (see below), whose sum is σ = 88704. Its totient is φ = 43160.

The previous prime is 65629. The next prime is 65633. The reversal of 65631 is 13656.

It is an interprime number because it is at equal distance from previous prime (65629) and next prime (65633).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65631 - 2¹ = 65629 is a prime.

It is a super-2 number, since 2×65631² = 8614856322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65598 and 65607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310 + ... + 476.

It is an arithmetic number, because the mean of its divisors is an integer number (11088).

2⁶⁵⁶³¹ is an apocalyptic number.

65631 is a deficient number, since it is larger than the sum of its proper divisors (23073).

65631 is a wasteful number, since it uses less digits than its factorization.

65631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its digits is 540, while the sum is 21.

The square root of 65631 is about 256.1854796822. The cubic root of 65631 is about 40.3369453921.

It can be divided in two parts, 65 and 631, that added together give a palindrome (696).

The spelling of 65631 in words is "sixty-five thousand, six hundred thirty-one".