256717343 has 2 divisors, whose sum is σ = 256717344. Its totient is φ = 256717342.

The previous prime is 256717333. The next prime is 256717361. The reversal of 256717343 is 343717652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256717343 - 2¹⁰ = 256716319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256717297 and 256717306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256717333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128358671 + 128358672.

It is an arithmetic number, because the mean of its divisors is an integer number (128358672).

Almost surely, 2^256717343 is an apocalyptic number.

256717343 is a deficient number, since it is larger than the sum of its proper divisors (1).

256717343 is an equidigital number, since it uses as much as digits as its factorization.

256717343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 38.

The square root of 256717343 is about 16022.4012869482. The cubic root of 256717343 is about 635.5529463516.

The spelling of 256717343 in words is "two hundred fifty-six million, seven hundred seventeen thousand, three hundred forty-three".