23256181 has 4 divisors (see below), whose sum is σ = 25045132. Its totient is φ = 21467232.

The previous prime is 23256179. The next prime is 23256193. The reversal of 23256181 is 18165232.

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 1782225 + 21473956 = 1335^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 23256181 - 2¹ = 23256179 is a prime.

It is a super-2 number, since 2×23256181² = 1081699909409522, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23256281) 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, 894456 + ... + 894481.

It is an arithmetic number, because the mean of its divisors is an integer number (6261283).

Almost surely, 2^23256181 is an apocalyptic number.

It is an amenable number.

23256181 is a deficient number, since it is larger than the sum of its proper divisors (1788951).

23256181 is a wasteful number, since it uses less digits than its factorization.

23256181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788950.

The product of its digits is 2880, while the sum is 28.

The square root of 23256181 is about 4822.4662777463. The cubic root of 23256181 is about 285.4386637589.

The spelling of 23256181 in words is "twenty-three million, two hundred fifty-six thousand, one hundred eighty-one".