23181245 has 4 divisors (see below), whose sum is σ = 27817500. Its totient is φ = 18544992.

The previous prime is 23181241. The next prime is 23181253. The reversal of 23181245 is 54218132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11600836 + 11580409 = 3406^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 23181245 - 2² = 23181241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181241) 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, 2318120 + ... + 2318129.

It is an arithmetic number, because the mean of its divisors is an integer number (6954375).

Almost surely, 2^23181245 is an apocalyptic number.

It is an amenable number.

23181245 is a deficient number, since it is larger than the sum of its proper divisors (4636255).

23181245 is an equidigital number, since it uses as much as digits as its factorization.

23181245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636254.

The product of its digits is 1920, while the sum is 26.

The square root of 23181245 is about 4814.6905404190. The cubic root of 23181245 is about 285.1317539988.

Adding to 23181245 its reverse (54218132), we get a palindrome (77399377).

The spelling of 23181245 in words is "twenty-three million, one hundred eighty-one thousand, two hundred forty-five".