1555189 has 2 divisors, whose sum is σ = 1555190. Its totient is φ = 1555188.

The previous prime is 1555187. The next prime is 1555193. The reversal of 1555189 is 9815551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 736164 = 905^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555189 - 2¹ = 1555187 is a prime.

It is a super-2 number, since 2×1555189² = 4837225651442, which contains 22 as substring.

Together with 1555187, it forms a pair of twin primes.

1555189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777594 + 777595.

It is an arithmetic number, because the mean of its divisors is an integer number (777595).

2^1555189 is an apocalyptic number.

It is an amenable number.

1555189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555189 is an equidigital number, since it uses as much as digits as its factorization.

1555189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 34.

The square root of 1555189 is about 1247.0721711272. The cubic root of 1555189 is about 115.8584529940.

The spelling of 1555189 in words is "one million, five hundred fifty-five thousand, one hundred eighty-nine".