23005631 has 4 divisors (see below), whose sum is σ = 25097064. Its totient is φ = 20914200.

The previous prime is 23005621. The next prime is 23005639. The reversal of 23005631 is 13650032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23005631 is a prime.

It is a super-2 number, since 2×23005631² = 1058518115416322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23005639) 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, 1045700 + ... + 1045721.

It is an arithmetic number, because the mean of its divisors is an integer number (6274266).

Almost surely, 2^23005631 is an apocalyptic number.

23005631 is a deficient number, since it is larger than the sum of its proper divisors (2091433).

23005631 is a wasteful number, since it uses less digits than its factorization.

23005631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091432.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 23005631 is about 4796.4185597172. The cubic root of 23005631 is about 284.4099045189.

Adding to 23005631 its reverse (13650032), we get a palindrome (36655663).

The spelling of 23005631 in words is "twenty-three million, five thousand, six hundred thirty-one".