561162161 has 24 divisors (see below), whose sum is σ = 664540200. Its totient is φ = 472416000.

The previous prime is 561162149. The next prime is 561162167. The reversal of 561162161 is 161261165.

561162161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5664400 + 555497761 = 2380^2 + 23569^2 .

It is not a de Polignac number, because 561162161 - 2²⁶ = 494053297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561162167) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 737021 + ... + 737781.

It is an arithmetic number, because the mean of its divisors is an integer number (27689175).

Almost surely, 2^561162161 is an apocalyptic number.

It is an amenable number.

561162161 is a deficient number, since it is larger than the sum of its proper divisors (103378039).

561162161 is a wasteful number, since it uses less digits than its factorization.

561162161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1018 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 561162161 is about 23688.8615387063. The cubic root of 561162161 is about 824.8268561041.

The spelling of 561162161 in words is "five hundred sixty-one million, one hundred sixty-two thousand, one hundred sixty-one".