256998359 has 4 divisors (see below), whose sum is σ = 257492160. Its totient is φ = 256504560.

The previous prime is 256998341. The next prime is 256998361. The reversal of 256998359 is 953899652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256998359 - 2⁸ = 256998103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256997359) 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 3 ways as a sum of consecutive naturals, for example, 246119 + ... + 247160.

It is an arithmetic number, because the mean of its divisors is an integer number (64373040).

Almost surely, 2^256998359 is an apocalyptic number.

256998359 is a deficient number, since it is larger than the sum of its proper divisors (493801).

256998359 is an equidigital number, since it uses as much as digits as its factorization.

256998359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493800.

The product of its digits is 5248800, while the sum is 56.

The square root of 256998359 is about 16031.1683604159. The cubic root of 256998359 is about 635.7847647604.

The spelling of 256998359 in words is "two hundred fifty-six million, nine hundred ninety-eight thousand, three hundred fifty-nine".