1166012809 has 4 divisors (see below), whose sum is σ = 1255706116. Its totient is φ = 1076319504.

The previous prime is 1166012753. The next prime is 1166012821. The reversal of 1166012809 is 9082106611.

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 740003209 + 426009600 = 27203^2 + 20640^2 .

It is not a de Polignac number, because 1166012809 - 2⁷ = 1166012681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166012909) 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, 44846634 + ... + 44846659.

It is an arithmetic number, because the mean of its divisors is an integer number (313926529).

Almost surely, 2^1166012809 is an apocalyptic number.

It is an amenable number.

1166012809 is a deficient number, since it is larger than the sum of its proper divisors (89693307).

1166012809 is an equidigital number, since it uses as much as digits as its factorization.

1166012809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89693306.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1166012809 is about 34146.9297155689. The cubic root of 1166012809 is about 1052.5298961836.

The spelling of 1166012809 in words is "one billion, one hundred sixty-six million, twelve thousand, eight hundred nine".