9665631 has 12 divisors (see below), whose sum is σ = 14093352. Its totient is φ = 6382896.

The previous prime is 9665609. The next prime is 9665641. The reversal of 9665631 is 1365669.

9665631 is a `hidden beast` number, since 96 + 6 + 563 + 1 = 666.

It is not a de Polignac number, because 9665631 - 2⁶ = 9665567 is a prime.

It is a super-2 number, since 2×9665631² = 186848845256322, which contains 22 as substring.

It is an Ulam number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4056 + ... + 5981.

It is an arithmetic number, because the mean of its divisors is an integer number (1174446).

Almost surely, 2^9665631 is an apocalyptic number.

9665631 is a deficient number, since it is larger than the sum of its proper divisors (4427721).

9665631 is a wasteful number, since it uses less digits than its factorization.

9665631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150 (or 10147 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 9665631 is about 3108.9597938861. The cubic root of 9665631 is about 213.0149430765.

It can be divided in two parts, 9665 and 631, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 9665631 in words is "nine million, six hundred sixty-five thousand, six hundred thirty-one".