256313 has 2 divisors, whose sum is σ = 256314. Its totient is φ = 256312.

The previous prime is 256307. The next prime is 256337. The reversal of 256313 is 313652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182329 + 73984 = 427^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 256313 - 2⁸ = 256057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128156 + 128157.

It is an arithmetic number, because the mean of its divisors is an integer number (128157).

2²⁵⁶³¹³ is an apocalyptic number.

It is an amenable number.

256313 is a deficient number, since it is larger than the sum of its proper divisors (1).

256313 is an equidigital number, since it uses as much as digits as its factorization.

256313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 20.

The square root of 256313 is about 506.2736414233. The cubic root of 256313 is about 63.5219094835.

Adding to 256313 its reverse (313652), we get a palindrome (569965).

The spelling of 256313 in words is "two hundred fifty-six thousand, three hundred thirteen".