23105557 has 6 divisors (see below), whose sum is σ = 23376098. Its totient is φ = 22838112.

The previous prime is 23105549. The next prime is 23105573. The reversal of 23105557 is 75550132.

It can be written as a sum of positive squares in 3 ways, for example, as 4104676 + 19000881 = 2026^2 + 4359^2 .

It is not a de Polignac number, because 23105557 - 2³ = 23105549 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 (23105527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6463 + ... + 9379.

Almost surely, 2^23105557 is an apocalyptic number.

It is an amenable number.

23105557 is a deficient number, since it is larger than the sum of its proper divisors (270541).

23105557 is an frugal number, since it uses more digits than its factorization.

23105557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095 (or 3006 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 23105557 is about 4806.8240034351. The cubic root of 23105557 is about 284.8210921879.

Adding to 23105557 its reverse (75550132), we get a palindrome (98655689).

The spelling of 23105557 in words is "twenty-three million, one hundred five thousand, five hundred fifty-seven".