155446189 has 2 divisors, whose sum is σ = 155446190. Its totient is φ = 155446188.

The previous prime is 155446141. The next prime is 155446267. The reversal of 155446189 is 981644551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133749225 + 21696964 = 11565^2 + 4658^2 .

It is a cyclic number.

It is not a de Polignac number, because 155446189 - 2²¹ = 153349037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155446289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77723094 + 77723095.

It is an arithmetic number, because the mean of its divisors is an integer number (77723095).

Almost surely, 2^155446189 is an apocalyptic number.

It is an amenable number.

155446189 is a deficient number, since it is larger than the sum of its proper divisors (1).

155446189 is an equidigital number, since it uses as much as digits as its factorization.

155446189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 155446189 is about 12467.8061021176. The cubic root of 155446189 is about 537.6834797439.

The spelling of 155446189 in words is "one hundred fifty-five million, four hundred forty-six thousand, one hundred eighty-nine".