23145557 has 4 divisors (see below), whose sum is σ = 23156256. Its totient is φ = 23134860.

The previous prime is 23145547. The next prime is 23145569. The reversal of 23145557 is 75554132.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23145557 - 2⁴ = 23145541 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 (23145527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833 + ... + 6854.

It is an arithmetic number, because the mean of its divisors is an integer number (5789064).

Almost surely, 2^23145557 is an apocalyptic number.

It is an amenable number.

23145557 is a deficient number, since it is larger than the sum of its proper divisors (10699).

23145557 is an equidigital number, since it uses as much as digits as its factorization.

23145557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10698.

The product of its digits is 21000, while the sum is 32.

The square root of 23145557 is about 4810.9829556963. The cubic root of 23145557 is about 284.9853567936.

Adding to 23145557 its reverse (75554132), we get a palindrome (98699689).

The spelling of 23145557 in words is "twenty-three million, one hundred forty-five thousand, five hundred fifty-seven".