23131553 has 4 divisors (see below), whose sum is σ = 23149380. Its totient is φ = 23113728.

The previous prime is 23131547. The next prime is 23131573. The reversal of 23131553 is 35513132.

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 2274064 + 20857489 = 1508^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131553 - 2¹⁸ = 22869409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131513) 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, 6800 + ... + 9617.

It is an arithmetic number, because the mean of its divisors is an integer number (5787345).

Almost surely, 2^23131553 is an apocalyptic number.

It is an amenable number.

23131553 is a deficient number, since it is larger than the sum of its proper divisors (17827).

23131553 is a wasteful number, since it uses less digits than its factorization.

23131553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17826.

The product of its digits is 1350, while the sum is 23.

The square root of 23131553 is about 4809.5273156517. The cubic root of 23131553 is about 284.9278693011.

Adding to 23131553 its reverse (35513132), we get a palindrome (58644685).

The spelling of 23131553 in words is "twenty-three million, one hundred thirty-one thousand, five hundred fifty-three".