256676281 has 4 divisors (see below), whose sum is σ = 258094564. Its totient is φ = 255258000.

The previous prime is 256676279. The next prime is 256676323. The reversal of 256676281 is 182676652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4343056 + 252333225 = 2084^2 + 15885^2 .

It is a cyclic number.

It is not a de Polignac number, because 256676281 - 2¹ = 256676279 is a prime.

It is a super-2 number, since 2×256676281² = 131765426455981922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256676221) 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, 708870 + ... + 709231.

It is an arithmetic number, because the mean of its divisors is an integer number (64523641).

Almost surely, 2^256676281 is an apocalyptic number.

It is an amenable number.

256676281 is a deficient number, since it is larger than the sum of its proper divisors (1418283).

256676281 is a wasteful number, since it uses less digits than its factorization.

256676281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418282.

The product of its digits is 241920, while the sum is 43.

The square root of 256676281 is about 16021.1198422582. The cubic root of 256676281 is about 635.5190589298.

The spelling of 256676281 in words is "two hundred fifty-six million, six hundred seventy-six thousand, two hundred eighty-one".