1115226209 has 4 divisors (see below), whose sum is σ = 1151201280. Its totient is φ = 1079251140.

The previous prime is 1115226179. The next prime is 1115226221. The reversal of 1115226209 is 9026225111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9026225111 = 859 ⋅10507829.

It is a cyclic number.

It is not a de Polignac number, because 1115226209 - 2²⁴ = 1098448993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115226289) 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, 17987489 + ... + 17987550.

It is an arithmetic number, because the mean of its divisors is an integer number (287800320).

Almost surely, 2^1115226209 is an apocalyptic number.

It is an amenable number.

1115226209 is a deficient number, since it is larger than the sum of its proper divisors (35975071).

1115226209 is an equidigital number, since it uses as much as digits as its factorization.

1115226209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35975070.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1115226209 is about 33395.0027549033. The cubic root of 1115226209 is about 1037.0212499447.

The spelling of 1115226209 in words is "one billion, one hundred fifteen million, two hundred twenty-six thousand, two hundred nine".