155545189 has 4 divisors (see below), whose sum is σ = 164694924. Its totient is φ = 146395456.

The previous prime is 155545177. The next prime is 155545193. The reversal of 155545189 is 981545551.

It is a happy number.

155545189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100340289 + 55204900 = 10017^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 155545189 - 2⁵ = 155545157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155545129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4574842 + ... + 4574875.

It is an arithmetic number, because the mean of its divisors is an integer number (41173731).

Almost surely, 2^155545189 is an apocalyptic number.

It is an amenable number.

155545189 is a deficient number, since it is larger than the sum of its proper divisors (9149735).

155545189 is an equidigital number, since it uses as much as digits as its factorization.

155545189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149734.

The product of its digits is 180000, while the sum is 43.

The square root of 155545189 is about 12471.7756955455. The cubic root of 155545189 is about 537.7976014825.

The spelling of 155545189 in words is "one hundred fifty-five million, five hundred forty-five thousand, one hundred eighty-nine".