255428189 has 4 divisors (see below), whose sum is σ = 263667840. Its totient is φ = 247188540.

The previous prime is 255428177. The next prime is 255428197. The reversal of 255428189 is 981824552.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255428189 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 (255428149) 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, 4119779 + ... + 4119840.

It is an arithmetic number, because the mean of its divisors is an integer number (65916960).

Almost surely, 2^255428189 is an apocalyptic number.

It is an amenable number.

255428189 is a deficient number, since it is larger than the sum of its proper divisors (8239651).

255428189 is an equidigital number, since it uses as much as digits as its factorization.

255428189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8239650.

The product of its digits is 230400, while the sum is 44.

The square root of 255428189 is about 15982.1209168245. The cubic root of 255428189 is about 634.4873113905.

The spelling of 255428189 in words is "two hundred fifty-five million, four hundred twenty-eight thousand, one hundred eighty-nine".