23531131 has 4 divisors (see below), whose sum is σ = 25341232. Its totient is φ = 21721032.

The previous prime is 23531117. The next prime is 23531141. The reversal of 23531131 is 13113532.

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 23531131 - 2¹⁹ = 23006843 is a prime.

It is a super-2 number, since 2×23531131² = 1107428252278322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23531099 and 23531108.

It is not an unprimeable number, because it can be changed into a prime (23531141) 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, 905031 + ... + 905056.

It is an arithmetic number, because the mean of its divisors is an integer number (6335308).

Almost surely, 2^23531131 is an apocalyptic number.

23531131 is a deficient number, since it is larger than the sum of its proper divisors (1810101).

23531131 is a wasteful number, since it uses less digits than its factorization.

23531131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810100.

The product of its digits is 270, while the sum is 19.

The square root of 23531131 is about 4850.8897122074. The cubic root of 23531131 is about 286.5591413634.

Adding to 23531131 its reverse (13113532), we get a palindrome (36644663).

The spelling of 23531131 in words is "twenty-three million, five hundred thirty-one thousand, one hundred thirty-one".