155189 has 4 divisors (see below), whose sum is σ = 156000. Its totient is φ = 154380.

The previous prime is 155171. The next prime is 155191. The reversal of 155189 is 981551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 981551 = 61 ⋅16091.

It is a cyclic number.

It is not a de Polignac number, because 155189 - 2⁸ = 154933 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155119) 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, 62 + ... + 560.

It is an arithmetic number, because the mean of its divisors is an integer number (39000).

2¹⁵⁵¹⁸⁹ is an apocalyptic number.

It is an amenable number.

155189 is a deficient number, since it is larger than the sum of its proper divisors (811).

155189 is an equidigital number, since it uses as much as digits as its factorization.

155189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810.

The product of its digits is 1800, while the sum is 29.

The square root of 155189 is about 393.9403508147. The cubic root of 155189 is about 53.7386779830.

The spelling of 155189 in words is "one hundred fifty-five thousand, one hundred eighty-nine".