256220271 has 6 divisors (see below), whose sum is σ = 370095960. Its totient is φ = 170813508.

The previous prime is 256220269. The next prime is 256220287. The reversal of 256220271 is 172022652.

It is not a de Polignac number, because 256220271 - 2¹ = 256220269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256220201) 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 5 ways as a sum of consecutive naturals, for example, 14234451 + ... + 14234468.

It is an arithmetic number, because the mean of its divisors is an integer number (61682660).

Almost surely, 2^256220271 is an apocalyptic number.

256220271 is a deficient number, since it is larger than the sum of its proper divisors (113875689).

256220271 is a wasteful number, since it uses less digits than its factorization.

256220271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28468925 (or 28468922 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 256220271 is about 16006.8819886947. The cubic root of 256220271 is about 635.1424823389.

The spelling of 256220271 in words is "two hundred fifty-six million, two hundred twenty thousand, two hundred seventy-one".