256211503 has 8 divisors (see below), whose sum is σ = 259117056. Its totient is φ = 253320600.

The previous prime is 256211477. The next prime is 256211507. The reversal of 256211503 is 305112652.

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 256211503 - 2¹⁷ = 256080431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256211507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33618 + ... + 40528.

It is an arithmetic number, because the mean of its divisors is an integer number (32389632).

Almost surely, 2^256211503 is an apocalyptic number.

256211503 is a deficient number, since it is larger than the sum of its proper divisors (2905553).

256211503 is a wasteful number, since it uses less digits than its factorization.

256211503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 256211503 is about 16006.6081041550. The cubic root of 256211503 is about 635.1352372801.

The spelling of 256211503 in words is "two hundred fifty-six million, two hundred eleven thousand, five hundred three".