23100561 has 24 divisors (see below), whose sum is σ = 38319840. Its totient is φ = 13262400.

The previous prime is 23100557. The next prime is 23100563. The reversal of 23100561 is 16500132.

23100561 is a `hidden beast` number, since 2 + 3 + 100 + 561 = 666.

It is not a de Polignac number, because 23100561 - 2² = 23100557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23100563) 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 23 ways as a sum of consecutive naturals, for example, 4260 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (1596660).

Almost surely, 2^23100561 is an apocalyptic number.

It is an amenable number.

23100561 is a deficient number, since it is larger than the sum of its proper divisors (15219279).

23100561 is a wasteful number, since it uses less digits than its factorization.

23100561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12317 (or 12314 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 23100561 is about 4806.3042974826. The cubic root of 23100561 is about 284.8005622240.

Adding to 23100561 its reverse (16500132), we get a palindrome (39600693).

The spelling of 23100561 in words is "twenty-three million, one hundred thousand, five hundred sixty-one".