256671115 has 4 divisors (see below), whose sum is σ = 308005344. Its totient is φ = 205336888.

The previous prime is 256671101. The next prime is 256671157. The reversal of 256671115 is 511176652.

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 256671115 - 2¹¹ = 256669067 is a prime.

It is a super-2 number, since 2×256671115² = 131760122550686450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 25667107 + ... + 25667116.

It is an arithmetic number, because the mean of its divisors is an integer number (77001336).

Almost surely, 2^256671115 is an apocalyptic number.

256671115 is a deficient number, since it is larger than the sum of its proper divisors (51334229).

256671115 is an equidigital number, since it uses as much as digits as its factorization.

256671115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51334228.

The product of its digits is 12600, while the sum is 34.

The square root of 256671115 is about 16020.9586167620. The cubic root of 256671115 is about 635.5147953058.

The spelling of 256671115 in words is "two hundred fifty-six million, six hundred seventy-one thousand, one hundred fifteen".