126256243 has 2 divisors, whose sum is σ = 126256244. Its totient is φ = 126256242.

The previous prime is 126256219. The next prime is 126256253. The reversal of 126256243 is 342652621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126256243 is a prime.

It is not a weakly prime, because it can be changed into another prime (126256253) 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, 63128121 + 63128122.

It is an arithmetic number, because the mean of its divisors is an integer number (63128122).

Almost surely, 2^126256243 is an apocalyptic number.

126256243 is a deficient number, since it is larger than the sum of its proper divisors (1).

126256243 is an equidigital number, since it uses as much as digits as its factorization.

126256243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 126256243 is about 11236.3803335416. The cubic root of 126256243 is about 501.6694105998.

The spelling of 126256243 in words is "one hundred twenty-six million, two hundred fifty-six thousand, two hundred forty-three".