256497271 has 4 divisors (see below), whose sum is σ = 262753344. Its totient is φ = 250241200.

The previous prime is 256497251. The next prime is 256497287. The reversal of 256497271 is 172794652.

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 256497271 - 2¹¹ = 256495223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256497211) 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, 3127975 + ... + 3128056.

It is an arithmetic number, because the mean of its divisors is an integer number (65688336).

Almost surely, 2^256497271 is an apocalyptic number.

256497271 is a deficient number, since it is larger than the sum of its proper divisors (6256073).

256497271 is an equidigital number, since it uses as much as digits as its factorization.

256497271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256072.

The product of its digits is 211680, while the sum is 43.

The square root of 256497271 is about 16015.5321797310. The cubic root of 256497271 is about 635.3712843042.

The spelling of 256497271 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, two hundred seventy-one".