23181325 has 12 divisors (see below), whose sum is σ = 28821940. Its totient is φ = 18495360.

The previous prime is 23181317. The next prime is 23181329. The reversal of 23181325 is 52318132.

It can be written as a sum of positive squares in 6 ways, for example, as 3697929 + 19483396 = 1923^2 + 4414^2 .

It is not a de Polignac number, because 23181325 - 2³ = 23181317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 23181325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10411 + ... + 12439.

Almost surely, 2^23181325 is an apocalyptic number.

23181325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23181325 is a deficient number, since it is larger than the sum of its proper divisors (5640615).

23181325 is a wasteful number, since it uses less digits than its factorization.

23181325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496 (or 2491 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 23181325 is about 4814.6988483186. The cubic root of 23181325 is about 285.1320820013.

Adding to 23181325 its reverse (52318132), we get a palindrome (75499457).

The spelling of 23181325 in words is "twenty-three million, one hundred eighty-one thousand, three hundred twenty-five".