23002561 has 4 divisors (see below), whose sum is σ = 23027652. Its totient is φ = 22977472.

The previous prime is 23002543. The next prime is 23002607. The reversal of 23002561 is 16520032.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 10042561 = 3600^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 23002561 - 2⁷ = 23002433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23002501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11116 + ... + 13021.

It is an arithmetic number, because the mean of its divisors is an integer number (5756913).

Almost surely, 2^23002561 is an apocalyptic number.

It is an amenable number.

23002561 is a deficient number, since it is larger than the sum of its proper divisors (25091).

23002561 is an equidigital number, since it uses as much as digits as its factorization.

23002561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25090.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 23002561 is about 4796.0985185878. The cubic root of 23002561 is about 284.3972528736.

Adding to 23002561 its reverse (16520032), we get a palindrome (39522593).

The spelling of 23002561 in words is "twenty-three million, two thousand, five hundred sixty-one".