256299343 has 2 divisors, whose sum is σ = 256299344. Its totient is φ = 256299342.

The previous prime is 256299313. The next prime is 256299353. The reversal of 256299343 is 343992652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256299343 - 2⁵ = 256299311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256299343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256299313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128149671 + 128149672.

It is an arithmetic number, because the mean of its divisors is an integer number (128149672).

Almost surely, 2^256299343 is an apocalyptic number.

256299343 is a deficient number, since it is larger than the sum of its proper divisors (1).

256299343 is an equidigital number, since it uses as much as digits as its factorization.

256299343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 43.

The square root of 256299343 is about 16009.3517357824. The cubic root of 256299343 is about 635.2078126121.

The spelling of 256299343 in words is "two hundred fifty-six million, two hundred ninety-nine thousand, three hundred forty-three".