256481275 has 6 divisors (see below), whose sum is σ = 318036812. Its totient is φ = 205185000.

The previous prime is 256481273. The next prime is 256481287. The reversal of 256481275 is 572184652.

It is not a de Polignac number, because 256481275 - 2¹ = 256481273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256481273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5129601 + ... + 5129650.

Almost surely, 2^256481275 is an apocalyptic number.

256481275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256481275 is a deficient number, since it is larger than the sum of its proper divisors (61555537).

256481275 is a wasteful number, since it uses less digits than its factorization.

256481275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10259261 (or 10259256 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The square root of 256481275 is about 16015.0327817335. The cubic root of 256481275 is about 635.3580760931.

The spelling of 256481275 in words is "two hundred fifty-six million, four hundred eighty-one thousand, two hundred seventy-five".