256349 has 2 divisors, whose sum is σ = 256350. Its totient is φ = 256348.

The previous prime is 256337. The next prime is 256363. The reversal of 256349 is 943652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232324 + 24025 = 482^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 256349 - 2⁸ = 256093 is a prime.

It is a super-3 number, since 3×256349³ = 50537777333029647, which contains 333 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2³ + 5⁷ + 3¹¹ + 6² + 4⁵ + 9 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128174 + 128175.

It is an arithmetic number, because the mean of its divisors is an integer number (128175).

2²⁵⁶³⁴⁹ is an apocalyptic number.

It is an amenable number.

256349 is a deficient number, since it is larger than the sum of its proper divisors (1).

256349 is an equidigital number, since it uses as much as digits as its factorization.

256349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 256349 is about 506.3091940702. The cubic root of 256349 is about 63.5248832977.

The spelling of 256349 in words is "two hundred fifty-six thousand, three hundred forty-nine".