161181189 has 24 divisors (see below), whose sum is σ = 256069632. Its totient is φ = 97074720.

The previous prime is 161181187. The next prime is 161181193. The reversal of 161181189 is 981181161.

161181189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161181189 - 2¹ = 161181187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161181187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9157 + ... + 20154.

It is an arithmetic number, because the mean of its divisors is an integer number (10669568).

Almost surely, 2^161181189 is an apocalyptic number.

It is an amenable number.

161181189 is a deficient number, since it is larger than the sum of its proper divisors (94888443).

161181189 is a wasteful number, since it uses less digits than its factorization.

161181189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29377 (or 29374 counting only the distinct ones).

The product of its digits is 3456, while the sum is 36.

The square root of 161181189 is about 12695.7153796074. The cubic root of 161181189 is about 544.2161826864.

The spelling of 161181189 in words is "one hundred sixty-one million, one hundred eighty-one thousand, one hundred eighty-nine".