23135231 has 4 divisors (see below), whose sum is σ = 26440272. Its totient is φ = 19830192.

The previous prime is 23135197. The next prime is 23135251. The reversal of 23135231 is 13253132.

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 23135231 - 2¹⁸ = 22873087 is a prime.

It is a super-2 number, since 2×23135231² = 1070477826846722, 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 (23135251) 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, 1652510 + ... + 1652523.

It is an arithmetic number, because the mean of its divisors is an integer number (6610068).

Almost surely, 2^23135231 is an apocalyptic number.

23135231 is a deficient number, since it is larger than the sum of its proper divisors (3305041).

23135231 is an equidigital number, since it uses as much as digits as its factorization.

23135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305040.

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

The square root of 23135231 is about 4809.9096665114. The cubic root of 23135231 is about 284.9429700189.

Adding to 23135231 its reverse (13253132), we get a palindrome (36388363).

The spelling of 23135231 in words is "twenty-three million, one hundred thirty-five thousand, two hundred thirty-one".