23145231 has 4 divisors (see below), whose sum is σ = 30860312. Its totient is φ = 15430152.

The previous prime is 23145209. The next prime is 23145271. The reversal of 23145231 is 13254132.

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

It is not a de Polignac number, because 23145231 - 2⁶ = 23145167 is a prime.

It is a super-2 number, since 2×23145231² = 1071403436086722, 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 = 23145198 and 23145207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23145271) 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, 3857536 + ... + 3857541.

It is an arithmetic number, because the mean of its divisors is an integer number (7715078).

Almost surely, 2^23145231 is an apocalyptic number.

23145231 is a deficient number, since it is larger than the sum of its proper divisors (7715081).

23145231 is an equidigital number, since it uses as much as digits as its factorization.

23145231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715080.

The product of its digits is 720, while the sum is 21.

The square root of 23145231 is about 4810.9490747668. The cubic root of 23145231 is about 284.9840188022.

Adding to 23145231 its reverse (13254132), we get a palindrome (36399363).

The spelling of 23145231 in words is "twenty-three million, one hundred forty-five thousand, two hundred thirty-one".