23963561 has 4 divisors (see below), whose sum is σ = 24473472. Its totient is φ = 23453652.

The previous prime is 23963507. The next prime is 23963573. The reversal of 23963561 is 16536932.

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.

It is a cyclic number.

It is not a de Polignac number, because 23963561 - 2⁶ = 23963497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23963501) 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, 254885 + ... + 254978.

It is an arithmetic number, because the mean of its divisors is an integer number (6118368).

Almost surely, 2^23963561 is an apocalyptic number.

It is an amenable number.

23963561 is a deficient number, since it is larger than the sum of its proper divisors (509911).

23963561 is an equidigital number, since it uses as much as digits as its factorization.

23963561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509910.

The product of its digits is 29160, while the sum is 35.

The square root of 23963561 is about 4895.2590329828. The cubic root of 23963561 is about 288.3038564169.

The spelling of 23963561 in words is "twenty-three million, nine hundred sixty-three thousand, five hundred sixty-one".