255613 has 2 divisors, whose sum is σ = 255614. Its totient is φ = 255612.

The previous prime is 255589. The next prime is 255617. The reversal of 255613 is 316552.

255613 = 357² + 358².

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128164 + 127449 = 358^2 + 357^2 .

It is a cyclic number.

It is not a de Polignac number, because 255613 - 2¹³ = 247421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127806 + 127807.

It is an arithmetic number, because the mean of its divisors is an integer number (127807).

2²⁵⁵⁶¹³ is an apocalyptic number.

255613 is the 358-th centered square number.

It is an amenable number.

255613 is a deficient number, since it is larger than the sum of its proper divisors (1).

255613 is an equidigital number, since it uses as much as digits as its factorization.

255613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 22.

The square root of 255613 is about 505.5818430284. The cubic root of 255613 is about 63.4640298897.

It can be divided in two parts, 255 and 613, that added together give a palindrome (868).

The spelling of 255613 in words is "two hundred fifty-five thousand, six hundred thirteen".