23939561 has 4 divisors (see below), whose sum is σ = 24159300. Its totient is φ = 23719824.

The previous prime is 23939557. The next prime is 23939581. The reversal of 23939561 is 16593932.

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 11689561 + 12250000 = 3419^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 23939561 - 2² = 23939557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23939521) 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, 109706 + ... + 109923.

It is an arithmetic number, because the mean of its divisors is an integer number (6039825).

Almost surely, 2^23939561 is an apocalyptic number.

It is an amenable number.

23939561 is a deficient number, since it is larger than the sum of its proper divisors (219739).

23939561 is a wasteful number, since it uses less digits than its factorization.

23939561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219738.

The product of its digits is 43740, while the sum is 38.

The square root of 23939561 is about 4892.8070675227. The cubic root of 23939561 is about 288.2075768506.

The spelling of 23939561 in words is "twenty-three million, nine hundred thirty-nine thousand, five hundred sixty-one".