256694899 has 4 divisors (see below), whose sum is σ = 261045720. Its totient is φ = 252344080.

The previous prime is 256694897. The next prime is 256694929. The reversal of 256694899 is 998496652.

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 256694899 - 2¹ = 256694897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256694897) 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, 2175322 + ... + 2175439.

It is an arithmetic number, because the mean of its divisors is an integer number (65261430).

Almost surely, 2^256694899 is an apocalyptic number.

256694899 is a deficient number, since it is larger than the sum of its proper divisors (4350821).

256694899 is an equidigital number, since it uses as much as digits as its factorization.

256694899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350820.

The product of its digits is 8398080, while the sum is 58.

The square root of 256694899 is about 16021.7008772477. The cubic root of 256694899 is about 635.5344243384.

The spelling of 256694899 in words is "two hundred fifty-six million, six hundred ninety-four thousand, eight hundred ninety-nine".