256303009 has 4 divisors (see below), whose sum is σ = 264570880. Its totient is φ = 248035140.

The previous prime is 256302973. The next prime is 256303031. The reversal of 256303009 is 900303652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256303009 - 2⁷ = 256302881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256303049) 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, 4133889 + ... + 4133950.

It is an arithmetic number, because the mean of its divisors is an integer number (66142720).

Almost surely, 2^256303009 is an apocalyptic number.

It is an amenable number.

256303009 is a deficient number, since it is larger than the sum of its proper divisors (8267871).

256303009 is an equidigital number, since it uses as much as digits as its factorization.

256303009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8267870.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 256303009 is about 16009.4662309522. The cubic root of 256303009 is about 635.2108411811.

The spelling of 256303009 in words is "two hundred fifty-six million, three hundred three thousand, nine".