15118561 has 2 divisors, whose sum is σ = 15118562. Its totient is φ = 15118560.

The previous prime is 15118553. The next prime is 15118577. The reversal of 15118561 is 16581151.

15118561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 342225 = 3844^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 15118561 - 2³ = 15118553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15118591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7559280 + 7559281.

It is an arithmetic number, because the mean of its divisors is an integer number (7559281).

Almost surely, 2^15118561 is an apocalyptic number.

It is an amenable number.

15118561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15118561 is an equidigital number, since it uses as much as digits as its factorization.

15118561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 28.

The square root of 15118561 is about 3888.2593792081. The cubic root of 15118561 is about 247.2692731238.

The spelling of 15118561 in words is "fifteen million, one hundred eighteen thousand, five hundred sixty-one".