256800289 has 4 divisors (see below), whose sum is σ = 257045680. Its totient is φ = 256554900.

The previous prime is 256800259. The next prime is 256800319. The reversal of 256800289 is 982008652.

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 an interprime number because it is at equal distance from previous prime (256800259) and next prime (256800319).

It is a cyclic number.

It is not a de Polignac number, because 256800289 - 2⁷ = 256800161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256800209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121119 + ... + 123220.

It is an arithmetic number, because the mean of its divisors is an integer number (64261420).

Almost surely, 2^256800289 is an apocalyptic number.

It is an amenable number.

256800289 is a deficient number, since it is larger than the sum of its proper divisors (245391).

256800289 is a wasteful number, since it uses less digits than its factorization.

256800289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245390.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 256800289 is about 16024.9895163772. The cubic root of 256800289 is about 635.6213885501.

The spelling of 256800289 in words is "two hundred fifty-six million, eight hundred thousand, two hundred eighty-nine".