161011189 has 2 divisors, whose sum is σ = 161011190. Its totient is φ = 161011188.

The previous prime is 161011181. The next prime is 161011211. The reversal of 161011189 is 981110161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159188689 + 1822500 = 12617^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 161011189 - 2³ = 161011181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161011181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80505594 + 80505595.

It is an arithmetic number, because the mean of its divisors is an integer number (80505595).

Almost surely, 2^161011189 is an apocalyptic number.

It is an amenable number.

161011189 is a deficient number, since it is larger than the sum of its proper divisors (1).

161011189 is an equidigital number, since it uses as much as digits as its factorization.

161011189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 28.

The square root of 161011189 is about 12689.0184411561. The cubic root of 161011189 is about 544.0247846353.

The spelling of 161011189 in words is "one hundred sixty-one million, eleven thousand, one hundred eighty-nine".