161110561 has 8 divisors (see below), whose sum is σ = 169058880. Its totient is φ = 153240912.

The previous prime is 161110531. The next prime is 161110589. The reversal of 161110561 is 165011161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161110561 is a prime.

It is a super-2 number, since 2×161110561² = 51913225731469442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161110511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15450 + ... + 23683.

It is an arithmetic number, because the mean of its divisors is an integer number (21132360).

Almost surely, 2^161110561 is an apocalyptic number.

It is an amenable number.

161110561 is a deficient number, since it is larger than the sum of its proper divisors (7948319).

161110561 is a wasteful number, since it uses less digits than its factorization.

161110561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39335.

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

The square root of 161110561 is about 12692.9335064830. The cubic root of 161110561 is about 544.1366810266.

The spelling of 161110561 in words is "one hundred sixty-one million, one hundred ten thousand, five hundred sixty-one".