23578561 has 2 divisors, whose sum is σ = 23578562. Its totient is φ = 23578560.

The previous prime is 23578549. The next prime is 23578571. The reversal of 23578561 is 16587532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16524225 + 7054336 = 4065^2 + 2656^2 .

It is a cyclic number.

It is not a de Polignac number, because 23578561 - 2⁷ = 23578433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23578561.

It is not a weakly prime, because it can be changed into another prime (23578501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11789280 + 11789281.

It is an arithmetic number, because the mean of its divisors is an integer number (11789281).

Almost surely, 2^23578561 is an apocalyptic number.

It is an amenable number.

23578561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23578561 is an equidigital number, since it uses as much as digits as its factorization.

23578561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 23578561 is about 4855.7760450828. The cubic root of 23578561 is about 286.7515443335.

The spelling of 23578561 in words is "twenty-three million, five hundred seventy-eight thousand, five hundred sixty-one".