155450189 has 2 divisors, whose sum is σ = 155450190. Its totient is φ = 155450188.

The previous prime is 155450173. The next prime is 155450263. The reversal of 155450189 is 981054551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93276964 + 62173225 = 9658^2 + 7885^2 .

It is a cyclic number.

It is not a de Polignac number, because 155450189 - 2⁴ = 155450173 is a prime.

It is a super-2 number, since 2×155450189² = 48329522520271442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155450129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77725094 + 77725095.

It is an arithmetic number, because the mean of its divisors is an integer number (77725095).

Almost surely, 2^155450189 is an apocalyptic number.

It is an amenable number.

155450189 is a deficient number, since it is larger than the sum of its proper divisors (1).

155450189 is an equidigital number, since it uses as much as digits as its factorization.

155450189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 155450189 is about 12467.9665142316. The cubic root of 155450189 is about 537.6880916624.

The spelling of 155450189 in words is "one hundred fifty-five million, four hundred fifty thousand, one hundred eighty-nine".