23361561 has 16 divisors (see below), whose sum is σ = 34848000. Its totient is φ = 15467184.

The previous prime is 23361539. The next prime is 23361589. The reversal of 23361561 is 16516332.

It is not a de Polignac number, because 23361561 - 2⁹ = 23361049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23361511) 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 15 ways as a sum of consecutive naturals, for example, 1120 + ... + 6926.

It is an arithmetic number, because the mean of its divisors is an integer number (2178000).

Almost surely, 2^23361561 is an apocalyptic number.

It is an amenable number.

23361561 is a deficient number, since it is larger than the sum of its proper divisors (11486439).

23361561 is a wasteful number, since it uses less digits than its factorization.

23361561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5965 (or 5959 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 23361561 is about 4833.3798733392. The cubic root of 23361561 is about 285.8691472737.

Adding to 23361561 its reverse (16516332), we get a palindrome (39877893).

The spelling of 23361561 in words is "twenty-three million, three hundred sixty-one thousand, five hundred sixty-one".