23115409 has 2 divisors, whose sum is σ = 23115410. Its totient is φ = 23115408.

The previous prime is 23115403. The next prime is 23115451. The reversal of 23115409 is 90451132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 6890625 = 4028^2 + 2625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23115409 is a prime.

It is not a weakly prime, because it can be changed into another prime (23115403) 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 as a sum of consecutive naturals, namely, 11557704 + 11557705.

It is an arithmetic number, because the mean of its divisors is an integer number (11557705).

Almost surely, 2^23115409 is an apocalyptic number.

It is an amenable number.

23115409 is a deficient number, since it is larger than the sum of its proper divisors (1).

23115409 is an equidigital number, since it uses as much as digits as its factorization.

23115409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 23115409 is about 4807.8486873029. The cubic root of 23115409 is about 284.8615681460.

The spelling of 23115409 in words is "twenty-three million, one hundred fifteen thousand, four hundred nine".