161220089 has 2 divisors, whose sum is σ = 161220090. Its totient is φ = 161220088.

The previous prime is 161220043. The next prime is 161220131. The reversal of 161220089 is 980022161.

161220089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161086864 + 133225 = 12692^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 161220089 - 2²⁴ = 144442873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161220989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80610044 + 80610045.

It is an arithmetic number, because the mean of its divisors is an integer number (80610045).

Almost surely, 2^161220089 is an apocalyptic number.

It is an amenable number.

161220089 is a deficient number, since it is larger than the sum of its proper divisors (1).

161220089 is an equidigital number, since it uses as much as digits as its factorization.

161220089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 161220089 is about 12697.2473001041. The cubic root of 161220089 is about 544.2599601412.

The spelling of 161220089 in words is "one hundred sixty-one million, two hundred twenty thousand, eighty-nine".