256251471 has 16 divisors (see below), whose sum is σ = 390703104. Its totient is φ = 146345184.

The previous prime is 256251451. The next prime is 256251497. The reversal of 256251471 is 174152652.

256251471 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 256251471 - 2⁵ = 256251439 is a prime.

It is a super-3 number, since 3×256251471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256251451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64581 + ... + 68433.

It is an arithmetic number, because the mean of its divisors is an integer number (24418944).

Almost surely, 2^256251471 is an apocalyptic number.

256251471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

256251471 is a deficient number, since it is larger than the sum of its proper divisors (134451633).

256251471 is a wasteful number, since it uses less digits than its factorization.

256251471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7030.

The product of its digits is 16800, while the sum is 33.

The square root of 256251471 is about 16007.8565398369. The cubic root of 256251471 is about 635.1682617735.

The spelling of 256251471 in words is "two hundred fifty-six million, two hundred fifty-one thousand, four hundred seventy-one".