23131533 has 4 divisors (see below), whose sum is σ = 30842048. Its totient is φ = 15421020.

The previous prime is 23131523. The next prime is 23131547. The reversal of 23131533 is 33513132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23131533 - 2⁴ = 23131517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131513) 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, 3855253 + ... + 3855258.

It is an arithmetic number, because the mean of its divisors is an integer number (7710512).

Almost surely, 2^23131533 is an apocalyptic number.

It is an amenable number.

23131533 is a deficient number, since it is larger than the sum of its proper divisors (7710515).

23131533 is an equidigital number, since it uses as much as digits as its factorization.

23131533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7710514.

The product of its digits is 810, while the sum is 21.

The square root of 23131533 is about 4809.5252364449. The cubic root of 23131533 is about 284.9277871830.

Adding to 23131533 its reverse (33513132), we get a palindrome (56644665).

The spelling of 23131533 in words is "twenty-three million, one hundred thirty-one thousand, five hundred thirty-three".