23231231 has 4 divisors (see below), whose sum is σ = 24597792. Its totient is φ = 21864672.

The previous prime is 23231213. The next prime is 23231237. The reversal of 23231231 is 13213232.

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 23231231 - 2¹⁴ = 23214847 is a prime.

It is a super-2 number, since 2×23231231² = 1079380187550722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1366543 = 23231231 / (2 + 3 + 2 + 3 + 1 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23231237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683255 + ... + 683288.

It is an arithmetic number, because the mean of its divisors is an integer number (6149448).

Almost surely, 2^23231231 is an apocalyptic number.

23231231 is a deficient number, since it is larger than the sum of its proper divisors (1366561).

23231231 is a wasteful number, since it uses less digits than its factorization.

23231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366560.

The product of its digits is 216, while the sum is 17.

The square root of 23231231 is about 4819.8787329143. The cubic root of 23231231 is about 285.3365512212.

Adding to 23231231 its reverse (13213232), we get a palindrome (36444463).

The spelling of 23231231 in words is "twenty-three million, two hundred thirty-one thousand, two hundred thirty-one".