15557161 has 2 divisors, whose sum is σ = 15557162. Its totient is φ = 15557160.

The previous prime is 15557117. The next prime is 15557173. The reversal of 15557161 is 16175551.

15557161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 2025 = 3944^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 15557161 - 2⁷ = 15557033 is a prime.

It is not a weakly prime, because it can be changed into another prime (15557761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7778580 + 7778581.

It is an arithmetic number, because the mean of its divisors is an integer number (7778581).

Almost surely, 2^15557161 is an apocalyptic number.

It is an amenable number.

15557161 is a deficient number, since it is larger than the sum of its proper divisors (1).

15557161 is an equidigital number, since it uses as much as digits as its factorization.

15557161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 31.

The square root of 15557161 is about 3944.2567107124. The cubic root of 15557161 is about 249.6376671132.

The spelling of 15557161 in words is "fifteen million, five hundred fifty-seven thousand, one hundred sixty-one".