126360209 has 2 divisors, whose sum is σ = 126360210. Its totient is φ = 126360208.

The previous prime is 126360197. The next prime is 126360211. The reversal of 126360209 is 902063621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89113600 + 37246609 = 9440^2 + 6103^2 .

It is a cyclic number.

It is not a de Polignac number, because 126360209 - 2⁴ = 126360193 is a prime.

Together with 126360211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126360239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63180104 + 63180105.

It is an arithmetic number, because the mean of its divisors is an integer number (63180105).

Almost surely, 2^126360209 is an apocalyptic number.

It is an amenable number.

126360209 is a deficient number, since it is larger than the sum of its proper divisors (1).

126360209 is an equidigital number, since it uses as much as digits as its factorization.

126360209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 126360209 is about 11241.0056934422. The cubic root of 126360209 is about 501.8070731056.

The spelling of 126360209 in words is "one hundred twenty-six million, three hundred sixty thousand, two hundred nine".