10661631 has 4 divisors (see below), whose sum is σ = 14215512. Its totient is φ = 7107752.

The previous prime is 10661611. The next prime is 10661653. The reversal of 10661631 is 13616601.

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 10661631 - 2⁷ = 10661503 is a prime.

It is a super-2 number, since 2×10661631² = 227340751160322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661611) 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, 1776936 + ... + 1776941.

It is an arithmetic number, because the mean of its divisors is an integer number (3553878).

Almost surely, 2^10661631 is an apocalyptic number.

10661631 is a deficient number, since it is larger than the sum of its proper divisors (3553881).

10661631 is an equidigital number, since it uses as much as digits as its factorization.

10661631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553880.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 10661631 is about 3265.2153068366. The cubic root of 10661631 is about 220.0938373800.

The spelling of 10661631 in words is "ten million, six hundred sixty-one thousand, six hundred thirty-one".