181120161 has 8 divisors (see below), whose sum is σ = 243395584. Its totient is φ = 119795760.

The previous prime is 181120153. The next prime is 181120189. The reversal of 181120161 is 161021181.

It is a happy number.

181120161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 181120161 - 2³ = 181120153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181120111) 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, 237310 + ... + 238071.

It is an arithmetic number, because the mean of its divisors is an integer number (30424448).

Almost surely, 2^181120161 is an apocalyptic number.

It is an amenable number.

181120161 is a deficient number, since it is larger than the sum of its proper divisors (62275423).

181120161 is a wasteful number, since it uses less digits than its factorization.

181120161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475511.

The product of its (nonzero) digits is 96, while the sum is 21.

The square root of 181120161 is about 13458.0890545426. The cubic root of 181120161 is about 565.7904315146.

The spelling of 181120161 in words is "one hundred eighty-one million, one hundred twenty thousand, one hundred sixty-one".