256351 has 4 divisors (see below), whose sum is σ = 257400. Its totient is φ = 255304.

The previous prime is 256349. The next prime is 256363. The reversal of 256351 is 153652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256351 - 2¹ = 256349 is a prime.

It is a Duffinian number.

256351 is a lucky number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (64350).

2²⁵⁶³⁵¹ is an apocalyptic number.

256351 is a deficient number, since it is larger than the sum of its proper divisors (1049).

256351 is an equidigital number, since it uses as much as digits as its factorization.

256351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048.

The product of its digits is 900, while the sum is 22.

The square root of 256351 is about 506.3111691440. The cubic root of 256351 is about 63.5250485014.

The spelling of 256351 in words is "two hundred fifty-six thousand, three hundred fifty-one".