23205131 has 4 divisors (see below), whose sum is σ = 23228064. Its totient is φ = 23182200.

The previous prime is 23205109. The next prime is 23205181. The reversal of 23205131 is 13150232.

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 23205131 - 2⁶ = 23205067 is a prime.

It is a super-2 number, since 2×23205131² = 1076956209454322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23205181) 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, 9875 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (5807016).

Almost surely, 2^23205131 is an apocalyptic number.

23205131 is a deficient number, since it is larger than the sum of its proper divisors (22933).

23205131 is a wasteful number, since it uses less digits than its factorization.

23205131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 23205131 is about 4817.1704350168. The cubic root of 23205131 is about 285.2296538194.

Adding to 23205131 its reverse (13150232), we get a palindrome (36355363).

The spelling of 23205131 in words is "twenty-three million, two hundred five thousand, one hundred thirty-one".