256603 has 2 divisors, whose sum is σ = 256604. Its totient is φ = 256602.

The previous prime is 256589. The next prime is 256609. The reversal of 256603 is 306652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256603 is a prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (256609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301 + 128302.

It is an arithmetic number, because the mean of its divisors is an integer number (128302).

2²⁵⁶⁶⁰³ is an apocalyptic number.

256603 is a deficient number, since it is larger than the sum of its proper divisors (1).

256603 is an equidigital number, since it uses as much as digits as its factorization.

256603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 256603 is about 506.5599668351. The cubic root of 256603 is about 63.5458573007.

The spelling of 256603 in words is "two hundred fifty-six thousand, six hundred three".