161161161 has 16 divisors (see below), whose sum is σ = 256257024. Its totient is φ = 88087824.

The previous prime is 161161129. The next prime is 161161171.

161161161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 161161161 - 2⁵ = 161161129 is a prime.

161161161 is a modest number, since divided by 161161 gives 161 as remainder.

It is not an unprimeable number, because it can be changed into a prime (161161171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166351 + ... + 167316.

It is an arithmetic number, because the mean of its divisors is an integer number (16016064).

Almost surely, 2^161161161 is an apocalyptic number.

It is an amenable number.

161161161 is a deficient number, since it is larger than the sum of its proper divisors (95095863).

161161161 is a wasteful number, since it uses less digits than its factorization.

161161161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333700.

The product of its digits is 216, while the sum is 24.

The square root of 161161161 is about 12694.9265850575. The cubic root of 161161161 is about 544.1936407400.

The spelling of 161161161 in words is "one hundred sixty-one million, one hundred sixty-one thousand, one hundred sixty-one".