154556189 has 2 divisors, whose sum is σ = 154556190. Its totient is φ = 154556188.

The previous prime is 154556131. The next prime is 154556219. The reversal of 154556189 is 981655451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152720164 + 1836025 = 12358^2 + 1355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154556189 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 (154556119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77278094 + 77278095.

It is an arithmetic number, because the mean of its divisors is an integer number (77278095).

Almost surely, 2^154556189 is an apocalyptic number.

It is an amenable number.

154556189 is a deficient number, since it is larger than the sum of its proper divisors (1).

154556189 is an equidigital number, since it uses as much as digits as its factorization.

154556189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 44.

The square root of 154556189 is about 12432.0629422474. The cubic root of 154556189 is about 536.6553544075.

The spelling of 154556189 in words is "one hundred fifty-four million, five hundred fifty-six thousand, one hundred eighty-nine".