23507231 has 4 divisors (see below), whose sum is σ = 25644264. Its totient is φ = 21370200.

The previous prime is 23507221. The next prime is 23507233. The reversal of 23507231 is 13270532.

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-23507231 is a prime.

It is a super-2 number, since 2×23507231² = 1105179818574722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23507197 and 23507206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23507233) 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, 1068500 + ... + 1068521.

It is an arithmetic number, because the mean of its divisors is an integer number (6411066).

Almost surely, 2^23507231 is an apocalyptic number.

23507231 is a deficient number, since it is larger than the sum of its proper divisors (2137033).

23507231 is a wasteful number, since it uses less digits than its factorization.

23507231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137032.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 23507231 is about 4848.4256207557. The cubic root of 23507231 is about 286.4620914384.

Adding to 23507231 its reverse (13270532), we get a palindrome (36777763).

The spelling of 23507231 in words is "twenty-three million, five hundred seven thousand, two hundred thirty-one".