255603 has 4 divisors (see below), whose sum is σ = 340808. Its totient is φ = 170400.

The previous prime is 255589. The next prime is 255613. The reversal of 255603 is 306552.

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

It is not a de Polignac number, because 255603 - 2⁴ = 255587 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 255603.

It is not an unprimeable number, because it can be changed into a prime (255613) 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, 42598 + ... + 42603.

It is an arithmetic number, because the mean of its divisors is an integer number (85202).

2²⁵⁵⁶⁰³ is an apocalyptic number.

255603 is a deficient number, since it is larger than the sum of its proper divisors (85205).

255603 is an equidigital number, since it uses as much as digits as its factorization.

255603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85204.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 255603 is about 505.5719533360. The cubic root of 255603 is about 63.4632022733.

It can be divided in two parts, 255 and 603, that added together give a palindrome (858).

The spelling of 255603 in words is "two hundred fifty-five thousand, six hundred three".