126299209 has 4 divisors (see below), whose sum is σ = 126323604. Its totient is φ = 126274816.

The previous prime is 126299207. The next prime is 126299227. The reversal of 126299209 is 902992621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40921609 + 85377600 = 6397^2 + 9240^2 .

It is a cyclic number.

It is not a de Polignac number, because 126299209 - 2¹ = 126299207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126299203) 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 in 3 ways as a sum of consecutive naturals, for example, 1012 + ... + 15925.

It is an arithmetic number, because the mean of its divisors is an integer number (31580901).

Almost surely, 2^126299209 is an apocalyptic number.

It is an amenable number.

126299209 is a deficient number, since it is larger than the sum of its proper divisors (24395).

126299209 is an equidigital number, since it uses as much as digits as its factorization.

126299209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24394.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 126299209 is about 11238.2920855440. The cubic root of 126299209 is about 501.7263115043.

The spelling of 126299209 in words is "one hundred twenty-six million, two hundred ninety-nine thousand, two hundred nine".