161236189 has 2 divisors, whose sum is σ = 161236190. Its totient is φ = 161236188.

The previous prime is 161236183. The next prime is 161236277. The reversal of 161236189 is 981632161.

161236189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128368900 + 32867289 = 11330^2 + 5733^2 .

It is a cyclic number.

It is not a de Polignac number, because 161236189 - 2³ = 161236181 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161236181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80618094 + 80618095.

It is an arithmetic number, because the mean of its divisors is an integer number (80618095).

Almost surely, 2^161236189 is an apocalyptic number.

It is an amenable number.

161236189 is a deficient number, since it is larger than the sum of its proper divisors (1).

161236189 is an equidigital number, since it uses as much as digits as its factorization.

161236189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 161236189 is about 12697.8812799616. The cubic root of 161236189 is about 544.2780767704.

The spelling of 161236189 in words is "one hundred sixty-one million, two hundred thirty-six thousand, one hundred eighty-nine".