23509131 has 4 divisors (see below), whose sum is σ = 31345512. Its totient is φ = 15672752.

The previous prime is 23509127. The next prime is 23509141. The reversal of 23509131 is 13190532.

It is a happy number.

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 23509131 - 2² = 23509127 is a prime.

It is a super-2 number, since 2×23509131² = 1105358480750322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23509121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3918186 + ... + 3918191.

It is an arithmetic number, because the mean of its divisors is an integer number (7836378).

Almost surely, 2^23509131 is an apocalyptic number.

23509131 is a deficient number, since it is larger than the sum of its proper divisors (7836381).

23509131 is an equidigital number, since it uses as much as digits as its factorization.

23509131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7836380.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 23509131 is about 4848.6215566901. The cubic root of 23509131 is about 286.4698091106.

Adding to 23509131 its reverse (13190532), we get a palindrome (36699663).

The spelling of 23509131 in words is "twenty-three million, five hundred nine thousand, one hundred thirty-one".