256122743 has 2 divisors, whose sum is σ = 256122744. Its totient is φ = 256122742.

The previous prime is 256122739. The next prime is 256122767. The reversal of 256122743 is 347221652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256122743 - 2² = 256122739 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256122343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128061371 + 128061372.

It is an arithmetic number, because the mean of its divisors is an integer number (128061372).

Almost surely, 2^256122743 is an apocalyptic number.

256122743 is a deficient number, since it is larger than the sum of its proper divisors (1).

256122743 is an equidigital number, since it uses as much as digits as its factorization.

256122743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 256122743 is about 16003.8352590871. The cubic root of 256122743 is about 635.0618849725.

The spelling of 256122743 in words is "two hundred fifty-six million, one hundred twenty-two thousand, seven hundred forty-three".