255634817 has 2 divisors, whose sum is σ = 255634818. Its totient is φ = 255634816.

The previous prime is 255634781. The next prime is 255634837. The reversal of 255634817 is 718436552.

Together with previous prime (255634781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189310081 + 66324736 = 13759^2 + 8144^2 .

It is a cyclic number.

It is not a de Polignac number, because 255634817 - 2¹² = 255630721 is a prime.

It is a super-4 number, since 4×255634817⁴ (a number of 35 digits) contains 4444 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255634837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127817408 + 127817409.

It is an arithmetic number, because the mean of its divisors is an integer number (127817409).

Almost surely, 2^255634817 is an apocalyptic number.

It is an amenable number.

255634817 is a deficient number, since it is larger than the sum of its proper divisors (1).

255634817 is an equidigital number, since it uses as much as digits as its factorization.

255634817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 255634817 is about 15988.5839585624. The cubic root of 255634817 is about 634.6583542562.

It can be divided in two parts, 2556 and 34817, that added together give a palindrome (37373).

The spelling of 255634817 in words is "two hundred fifty-five million, six hundred thirty-four thousand, eight hundred seventeen".