23000561 has 4 divisors (see below), whose sum is σ = 23010624. Its totient is φ = 22990500.

The previous prime is 23000557. The next prime is 23000563. The reversal of 23000561 is 16500032.

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 23000561 - 2² = 23000557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23000563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236 + ... + 6786.

It is an arithmetic number, because the mean of its divisors is an integer number (5752656).

Almost surely, 2^23000561 is an apocalyptic number.

It is an amenable number.

23000561 is a deficient number, since it is larger than the sum of its proper divisors (10063).

23000561 is an equidigital number, since it uses as much as digits as its factorization.

23000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10062.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 23000561 is about 4795.8900112492. The cubic root of 23000561 is about 284.3890101539.

Adding to 23000561 its reverse (16500032), we get a palindrome (39500593).

The spelling of 23000561 in words is "twenty-three million, five hundred sixty-one", and thus it is an aban number.