126600809 has 12 divisors (see below), whose sum is σ = 133881300. Its totient is φ = 119691264.

The previous prime is 126600787. The next prime is 126600821. The reversal of 126600809 is 908006621.

It can be written as a sum of positive squares in 2 ways, for example, as 12709225 + 113891584 = 3565^2 + 10672^2 .

It is a de Polignac number, because none of the positive numbers 2^k-126600809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126600829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45737 + ... + 48425.

It is an arithmetic number, because the mean of its divisors is an integer number (11156775).

Almost surely, 2^126600809 is an apocalyptic number.

It is an amenable number.

126600809 is a deficient number, since it is larger than the sum of its proper divisors (7280491).

126600809 is an equidigital number, since it uses as much as digits as its factorization.

126600809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 126600809 is about 11251.7024934007. The cubic root of 126600809 is about 502.1253648477.

The spelling of 126600809 in words is "one hundred twenty-six million, six hundred thousand, eight hundred nine".