23157553 has 4 divisors (see below), whose sum is σ = 24519780. Its totient is φ = 21795328.

The previous prime is 23157529. The next prime is 23157611. The reversal of 23157553 is 35575132.

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 18215824 + 4941729 = 4268^2 + 2223^2 .

It is a cyclic number.

It is not a de Polignac number, because 23157553 - 2²¹ = 21060401 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (23157503) 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, 681088 + ... + 681121.

It is an arithmetic number, because the mean of its divisors is an integer number (6129945).

Almost surely, 2^23157553 is an apocalyptic number.

It is an amenable number.

23157553 is a deficient number, since it is larger than the sum of its proper divisors (1362227).

23157553 is a wasteful number, since it uses less digits than its factorization.

23157553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362226.

The product of its digits is 15750, while the sum is 31.

The square root of 23157553 is about 4812.2295248668. The cubic root of 23157553 is about 285.0345828559.

The spelling of 23157553 in words is "twenty-three million, one hundred fifty-seven thousand, five hundred fifty-three".