118211051809 has 4 divisors (see below), whose sum is σ = 118274032404. Its totient is φ = 118148071216.

The previous prime is 118211051801. The next prime is 118211051831. The reversal of 118211051809 is 908150112811.

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 48477030625 + 69734021184 = 220175^2 + 264072^2 .

It is a cyclic number.

It is not a de Polignac number, because 118211051809 - 2³ = 118211051801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118211051801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31487482 + ... + 31491235.

It is an arithmetic number, because the mean of its divisors is an integer number (29568508101).

Almost surely, 2^118211051809 is an apocalyptic number.

It is an amenable number.

118211051809 is a deficient number, since it is larger than the sum of its proper divisors (62980595).

118211051809 is an equidigital number, since it uses as much as digits as its factorization.

118211051809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62980594.

The product of its (nonzero) digits is 5760, while the sum is 37.

The spelling of 118211051809 in words is "one hundred eighteen billion, two hundred eleven million, fifty-one thousand, eight hundred nine".