23161557 has 16 divisors (see below), whose sum is σ = 32030720. Its totient is φ = 14871600.

The previous prime is 23161547. The next prime is 23161559. The reversal of 23161557 is 75516132.

It is not a de Polignac number, because 23161557 - 2¹¹ = 23159509 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 (23161559) 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 15 ways as a sum of consecutive naturals, for example, 24744 + ... + 25662.

It is an arithmetic number, because the mean of its divisors is an integer number (2001920).

Almost surely, 2^23161557 is an apocalyptic number.

It is an amenable number.

23161557 is a deficient number, since it is larger than the sum of its proper divisors (8869163).

23161557 is a wasteful number, since it uses less digits than its factorization.

23161557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its digits is 6300, while the sum is 30.

The square root of 23161557 is about 4812.6455302671. The cubic root of 23161557 is about 285.0510096447.

Adding to 23161557 its reverse (75516132), we get a palindrome (98677689).

The spelling of 23161557 in words is "twenty-three million, one hundred sixty-one thousand, five hundred fifty-seven".