126228279209 has 4 divisors (see below), whose sum is σ = 126327128004. Its totient is φ = 126129430416.

The previous prime is 126228279187. The next prime is 126228279227. The reversal of 126228279209 is 902972822621.

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 35764483225 + 90463795984 = 189115^2 + 300772^2 .

It is a cyclic number.

It is not a de Polignac number, because 126228279209 - 2²⁴ = 126211501993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126228279259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49422482 + ... + 49425035.

It is an arithmetic number, because the mean of its divisors is an integer number (31581782001).

Almost surely, 2^126228279209 is an apocalyptic number.

It is an amenable number.

126228279209 is a deficient number, since it is larger than the sum of its proper divisors (98848795).

126228279209 is an equidigital number, since it uses as much as digits as its factorization.

126228279209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98848794.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 126228279209 in words is "one hundred twenty-six billion, two hundred twenty-eight million, two hundred seventy-nine thousand, two hundred nine".