255639889 has 4 divisors (see below), whose sum is σ = 269094640. Its totient is φ = 242185140.

The previous prime is 255639877. The next prime is 255639913. The reversal of 255639889 is 988936552.

255639889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-255639889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255639289) 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, 6727347 + ... + 6727384.

It is an arithmetic number, because the mean of its divisors is an integer number (67273660).

Almost surely, 2^255639889 is an apocalyptic number.

It is an amenable number.

255639889 is a deficient number, since it is larger than the sum of its proper divisors (13454751).

255639889 is a wasteful number, since it uses less digits than its factorization.

255639889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13454750.

The product of its digits is 4665600, while the sum is 55.

The square root of 255639889 is about 15988.7425709466. The cubic root of 255639889 is about 634.6625516055.

The spelling of 255639889 in words is "two hundred fifty-five million, six hundred thirty-nine thousand, eight hundred eighty-nine".