126686909 has 2 divisors, whose sum is σ = 126686910. Its totient is φ = 126686908.

The previous prime is 126686891. The next prime is 126686953. The reversal of 126686909 is 909686621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89208025 + 37478884 = 9445^2 + 6122^2 .

It is a cyclic number.

It is not a de Polignac number, because 126686909 - 2²⁴ = 109909693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126676909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63343454 + 63343455.

It is an arithmetic number, because the mean of its divisors is an integer number (63343455).

Almost surely, 2^126686909 is an apocalyptic number.

It is an amenable number.

126686909 is a deficient number, since it is larger than the sum of its proper divisors (1).

126686909 is an equidigital number, since it uses as much as digits as its factorization.

126686909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 126686909 is about 11255.5279307547. The cubic root of 126686909 is about 502.2391692727.

The spelling of 126686909 in words is "one hundred twenty-six million, six hundred eighty-six thousand, nine hundred nine".