155623189 has 2 divisors, whose sum is σ = 155623190. Its totient is φ = 155623188.

The previous prime is 155623159. The next prime is 155623217. The reversal of 155623189 is 981326551.

155623189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112720689 + 42902500 = 10617^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 155623189 - 2²⁵ = 122068757 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 (155623159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77811594 + 77811595.

It is an arithmetic number, because the mean of its divisors is an integer number (77811595).

Almost surely, 2^155623189 is an apocalyptic number.

It is an amenable number.

155623189 is a deficient number, since it is larger than the sum of its proper divisors (1).

155623189 is an equidigital number, since it uses as much as digits as its factorization.

155623189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 155623189 is about 12474.9023643474. The cubic root of 155623189 is about 537.8874814789.

The spelling of 155623189 in words is "one hundred fifty-five million, six hundred twenty-three thousand, one hundred eighty-nine".