255517 has 2 divisors, whose sum is σ = 255518. Its totient is φ = 255516.

The previous prime is 255511. The next prime is 255523. The reversal of 255517 is 715552.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (255511) and next prime (255523).

It can be written as a sum of positive squares in only one way, i.e., 236196 + 19321 = 486^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 255517 - 2¹¹ = 253469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255491 and 255500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255511) by changing a digit.

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 as a sum of consecutive naturals, namely, 127758 + 127759.

It is an arithmetic number, because the mean of its divisors is an integer number (127759).

2²⁵⁵⁵¹⁷ is an apocalyptic number.

It is an amenable number.

255517 is a deficient number, since it is larger than the sum of its proper divisors (1).

255517 is an equidigital number, since it uses as much as digits as its factorization.

255517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1750, while the sum is 25.

The square root of 255517 is about 505.4868939943. The cubic root of 255517 is about 63.4560838805.

The spelling of 255517 in words is "two hundred fifty-five thousand, five hundred seventeen".