126743809 has 2 divisors, whose sum is σ = 126743810. Its totient is φ = 126743808.

The previous prime is 126743801. The next prime is 126743821. The reversal of 126743809 is 908347621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113891584 + 12852225 = 10672^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 126743809 - 2³ = 126743801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126743801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63371904 + 63371905.

It is an arithmetic number, because the mean of its divisors is an integer number (63371905).

Almost surely, 2^126743809 is an apocalyptic number.

It is an amenable number.

126743809 is a deficient number, since it is larger than the sum of its proper divisors (1).

126743809 is an equidigital number, since it uses as much as digits as its factorization.

126743809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 126743809 is about 11258.0552938774. The cubic root of 126743809 is about 502.3143497093.

The spelling of 126743809 in words is "one hundred twenty-six million, seven hundred forty-three thousand, eight hundred nine".