256534003 has 4 divisors (see below), whose sum is σ = 279855288. Its totient is φ = 233212720.

The previous prime is 256533983. The next prime is 256534009. The reversal of 256534003 is 300435652.

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

It is a cyclic number.

It is not a de Polignac number, because 256534003 - 2⁹ = 256533491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256534009) 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 3 ways as a sum of consecutive naturals, for example, 11660626 + ... + 11660647.

It is an arithmetic number, because the mean of its divisors is an integer number (69963822).

Almost surely, 2^256534003 is an apocalyptic number.

256534003 is a deficient number, since it is larger than the sum of its proper divisors (23321285).

256534003 is a wasteful number, since it uses less digits than its factorization.

256534003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23321284.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 256534003 is about 16016.6789004462. The cubic root of 256534003 is about 635.4016125593.

Adding to 256534003 its reverse (300435652), we get a palindrome (556969655).

The spelling of 256534003 in words is "two hundred fifty-six million, five hundred thirty-four thousand, three".