256499 has 2 divisors, whose sum is σ = 256500. Its totient is φ = 256498.

The previous prime is 256493. The next prime is 256517. The reversal of 256499 is 994652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256499 - 2⁴ = 256483 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (256493) 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 as a sum of consecutive naturals, namely, 128249 + 128250.

It is an arithmetic number, because the mean of its divisors is an integer number (128250).

2²⁵⁶⁴⁹⁹ is an apocalyptic number.

256499 is a deficient number, since it is larger than the sum of its proper divisors (1).

256499 is an equidigital number, since it uses as much as digits as its factorization.

256499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 256499 is about 506.4573032349. The cubic root of 256499 is about 63.5372711941.

The spelling of 256499 in words is "two hundred fifty-six thousand, four hundred ninety-nine".