256503 has 8 divisors (see below), whose sum is σ = 368368. Its totient is φ = 157824.

The previous prime is 256499. The next prime is 256517. The reversal of 256503 is 305652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256503 - 2² = 256499 is a prime.

It is an alternating number because its digits alternate between even and odd.

256503 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 256503.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256503.

It is not an unprimeable number, because it can be changed into a prime (256603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3250 + ... + 3327.

It is an arithmetic number, because the mean of its divisors is an integer number (46046).

2²⁵⁶⁵⁰³ is an apocalyptic number.

256503 is a deficient number, since it is larger than the sum of its proper divisors (111865).

256503 is a wasteful number, since it uses less digits than its factorization.

256503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593.

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

The square root of 256503 is about 506.4612522198. The cubic root of 256503 is about 63.5376014718.

Adding to 256503 its product of nonzero digits (900), we get a triangular number (257403 = T₇₁₇).

The spelling of 256503 in words is "two hundred fifty-six thousand, five hundred three".