817255 has 8 divisors (see below), whose sum is σ = 993600. Its totient is φ = 645216.

The previous prime is 817237. The next prime is 817273. The reversal of 817255 is 552718.

It is an interprime number because it is at equal distance from previous prime (817237) and next prime (817273).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 817255 - 2⁷ = 817127 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (124200).

2⁸¹⁷²⁵⁵ is an apocalyptic number.

817255 is a deficient number, since it is larger than the sum of its proper divisors (176345).

817255 is a wasteful number, since it uses less digits than its factorization.

817255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153.

The product of its digits is 2800, while the sum is 28.

The square root of 817255 is about 904.0215705391. The cubic root of 817255 is about 93.4944566666.

It can be divided in two parts, 817 and 255, that multiplied together give a triangular number (208335 = T₆₄₅).

The spelling of 817255 in words is "eight hundred seventeen thousand, two hundred fifty-five".