23151231 has 8 divisors (see below), whose sum is σ = 34298160. Its totient is φ = 15434136.

The previous prime is 23151197. The next prime is 23151239. The reversal of 23151231 is 13215132.

It is not a de Polignac number, because 23151231 - 2¹¹ = 23149183 is a prime.

It is a super-2 number, since 2×23151231² = 1071958993630722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23151239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428700 + ... + 428753.

It is an arithmetic number, because the mean of its divisors is an integer number (4287270).

Almost surely, 2^23151231 is an apocalyptic number.

23151231 is a deficient number, since it is larger than the sum of its proper divisors (11146929).

23151231 is an equidigital number, since it uses as much as digits as its factorization.

23151231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857462 (or 857456 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 23151231 is about 4811.5726119430. The cubic root of 23151231 is about 285.0086423972.

Adding to 23151231 its reverse (13215132), we get a palindrome (36366363).

The spelling of 23151231 in words is "twenty-three million, one hundred fifty-one thousand, two hundred thirty-one".