255642857 has 4 divisors (see below), whose sum is σ = 255870420. Its totient is φ = 255415296.

The previous prime is 255642847. The next prime is 255642911. The reversal of 255642857 is 758246552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137616361 + 118026496 = 11731^2 + 10864^2 .

It is a cyclic number.

It is not a de Polignac number, because 255642857 - 2²² = 251448553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255642847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112088 + ... + 114345.

It is an arithmetic number, because the mean of its divisors is an integer number (63967605).

Almost surely, 2^255642857 is an apocalyptic number.

It is an amenable number.

255642857 is a deficient number, since it is larger than the sum of its proper divisors (227563).

255642857 is a wasteful number, since it uses less digits than its factorization.

255642857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227562.

The product of its digits is 672000, while the sum is 44.

The square root of 255642857 is about 15988.8353859811. The cubic root of 255642857 is about 634.6650077573.

The spelling of 255642857 in words is "two hundred fifty-five million, six hundred forty-two thousand, eight hundred fifty-seven".