561110161 has 2 divisors, whose sum is σ = 561110162. Its totient is φ = 561110160.

The previous prime is 561110149. The next prime is 561110167. The reversal of 561110161 is 161011165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554885136 + 6225025 = 23556^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 561110161 - 2⁹ = 561109649 is a prime.

It is a super-2 number, since 2×561110161² = 629689225554891842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561110167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555080 + 280555081.

It is an arithmetic number, because the mean of its divisors is an integer number (280555081).

Almost surely, 2^561110161 is an apocalyptic number.

It is an amenable number.

561110161 is a deficient number, since it is larger than the sum of its proper divisors (1).

561110161 is an equidigital number, since it uses as much as digits as its factorization.

561110161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 561110161 is about 23687.7639510360. The cubic root of 561110161 is about 824.8013778352.

The spelling of 561110161 in words is "five hundred sixty-one million, one hundred ten thousand, one hundred sixty-one".