23336561 has 4 divisors (see below), whose sum is σ = 24141300. Its totient is φ = 22531824.

The previous prime is 23336549. The next prime is 23336591. The reversal of 23336561 is 16563332.

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 19936225 + 3400336 = 4465^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 23336561 - 2⁶ = 23336497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 804709 = 23336561 / (2 + 3 + 3 + 3 + 6 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23336501) 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 3 ways as a sum of consecutive naturals, for example, 402326 + ... + 402383.

It is an arithmetic number, because the mean of its divisors is an integer number (6035325).

Almost surely, 2^23336561 is an apocalyptic number.

It is an amenable number.

23336561 is a deficient number, since it is larger than the sum of its proper divisors (804739).

23336561 is an equidigital number, since it uses as much as digits as its factorization.

23336561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804738.

The product of its digits is 9720, while the sum is 29.

The square root of 23336561 is about 4830.7929990841. The cubic root of 23336561 is about 285.7671381154.

Adding to 23336561 its reverse (16563332), we get a palindrome (39899893).

The spelling of 23336561 in words is "twenty-three million, three hundred thirty-six thousand, five hundred sixty-one".