23115559 has 2 divisors, whose sum is σ = 23115560. Its totient is φ = 23115558.

The previous prime is 23115539. The next prime is 23115593. The reversal of 23115559 is 95551132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23115559 - 2¹⁵ = 23082791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23115559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23115509) 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, 11557779 + 11557780.

It is an arithmetic number, because the mean of its divisors is an integer number (11557780).

Almost surely, 2^23115559 is an apocalyptic number.

23115559 is a deficient number, since it is larger than the sum of its proper divisors (1).

23115559 is an equidigital number, since it uses as much as digits as its factorization.

23115559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

The square root of 23115559 is about 4807.8642867702. The cubic root of 23115559 is about 284.8621843171.

The spelling of 23115559 in words is "twenty-three million, one hundred fifteen thousand, five hundred fifty-nine".