23569561 has 2 divisors, whose sum is σ = 23569562. Its totient is φ = 23569560.

The previous prime is 23569541. The next prime is 23569597. The reversal of 23569561 is 16596532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 7529536 = 4005^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 23569561 - 2⁵ = 23569529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23569561.

It is not a weakly prime, because it can be changed into another prime (23569501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11784780 + 11784781.

It is an arithmetic number, because the mean of its divisors is an integer number (11784781).

Almost surely, 2^23569561 is an apocalyptic number.

It is an amenable number.

23569561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23569561 is an equidigital number, since it uses as much as digits as its factorization.

23569561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 37.

The square root of 23569561 is about 4854.8492252592. The cubic root of 23569561 is about 286.7150550791.

It can be divided in two parts, 235 and 69561, that added together give a palindrome (69796).

The spelling of 23569561 in words is "twenty-three million, five hundred sixty-nine thousand, five hundred sixty-one".