155161189 has 2 divisors, whose sum is σ = 155161190. Its totient is φ = 155161188.

The previous prime is 155161183. The next prime is 155161207. The reversal of 155161189 is 981161551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153338689 + 1822500 = 12383^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 155161189 - 2¹¹ = 155159141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155161183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77580594 + 77580595.

It is an arithmetic number, because the mean of its divisors is an integer number (77580595).

Almost surely, 2^155161189 is an apocalyptic number.

It is an amenable number.

155161189 is a deficient number, since it is larger than the sum of its proper divisors (1).

155161189 is an equidigital number, since it uses as much as digits as its factorization.

155161189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 37.

The square root of 155161189 is about 12456.3714218869. The cubic root of 155161189 is about 537.3546767033.

The spelling of 155161189 in words is "one hundred fifty-five million, one hundred sixty-one thousand, one hundred eighty-nine".