161160561 has 18 divisors (see below), whose sum is σ = 247290342. Its totient is φ = 101118720.

The previous prime is 161160551. The next prime is 161160589. The reversal of 161160561 is 165061161.

It can be written as a sum of positive squares in 3 ways, for example, as 99380961 + 61779600 = 9969^2 + 7860^2 .

It is not a de Polignac number, because 161160561 - 2¹⁵ = 161127793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161160541) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28380 + ... + 33581.

Almost surely, 2^161160561 is an apocalyptic number.

It is an amenable number.

161160561 is a deficient number, since it is larger than the sum of its proper divisors (86129781).

161160561 is a wasteful number, since it uses less digits than its factorization.

161160561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62001 (or 61981 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161160561 is about 12694.9029535479. The cubic root of 161160561 is about 544.1929653982.

The spelling of 161160561 in words is "one hundred sixty-one million, one hundred sixty thousand, five hundred sixty-one".