255815291 has 4 divisors (see below), whose sum is σ = 257509584. Its totient is φ = 254121000.

The previous prime is 255815267. The next prime is 255815333. The reversal of 255815291 is 192518552.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 255815291 - 2²² = 251620987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255815251) 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, 846920 + ... + 847221.

It is an arithmetic number, because the mean of its divisors is an integer number (64377396).

Almost surely, 2^255815291 is an apocalyptic number.

255815291 is a deficient number, since it is larger than the sum of its proper divisors (1694293).

255815291 is a wasteful number, since it uses less digits than its factorization.

255815291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694292.

The product of its digits is 36000, while the sum is 38.

The square root of 255815291 is about 15994.2268021933. The cubic root of 255815291 is about 634.8076719292.

The spelling of 255815291 in words is "two hundred fifty-five million, eight hundred fifteen thousand, two hundred ninety-one".