23306561 has 2 divisors, whose sum is σ = 23306562. Its totient is φ = 23306560.

The previous prime is 23306557. The next prime is 23306579. The reversal of 23306561 is 16560332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22505536 + 801025 = 4744^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 23306561 - 2² = 23306557 is a prime.

It is equal to p_1466333 and since 23306561 and 1466333 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23306561.

It is not a weakly prime, because it can be changed into another prime (23306461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11653280 + 11653281.

It is an arithmetic number, because the mean of its divisors is an integer number (11653281).

Almost surely, 2^23306561 is an apocalyptic number.

It is an amenable number.

23306561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23306561 is an equidigital number, since it uses as much as digits as its factorization.

23306561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 23306561 is about 4827.6869202549. The cubic root of 23306561 is about 285.6446309130.

Adding to 23306561 its reverse (16560332), we get a palindrome (39866893).

The spelling of 23306561 in words is "twenty-three million, three hundred six thousand, five hundred sixty-one".