256503313 has 8 divisors (see below), whose sum is σ = 279941760. Its totient is φ = 233084880.

The previous prime is 256503311. The next prime is 256503323. The reversal of 256503313 is 313305652.

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

It is a cyclic number.

It is not a de Polignac number, because 256503313 - 2¹ = 256503311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256503311) 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, 37656 + ... + 43942.

It is an arithmetic number, because the mean of its divisors is an integer number (34992720).

Almost surely, 2^256503313 is an apocalyptic number.

It is an amenable number.

256503313 is a deficient number, since it is larger than the sum of its proper divisors (23438447).

256503313 is a wasteful number, since it uses less digits than its factorization.

256503313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 256503313 is about 16015.7208080061. The cubic root of 256503313 is about 635.3762731593.

Adding to 256503313 its reverse (313305652), we get a palindrome (569808965).

The spelling of 256503313 in words is "two hundred fifty-six million, five hundred three thousand, three hundred thirteen".