1194218396809 has 3 divisors (see below), whose sum is σ = 1194219489613. Its totient is φ = 1194217304006.

The previous prime is 1194218396783. The next prime is 1194218396831. The reversal of 1194218396809 is 9086938124911.

The square root of 1194218396809 is 1092803.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1194218396809 - 2²⁵ = 1194184842377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1194218396009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 546402 + ... + 1639204.

Almost surely, 2^{1194218396809} is an apocalyptic number.

1194218396809 is the 1092803-rd square number.

1194218396809 is the 546402-nd centered octagonal number.

It is an amenable number.

1194218396809 is a deficient number, since it is larger than the sum of its proper divisors (1092804).

1194218396809 is an frugal number, since it uses more digits than its factorization.

1194218396809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185606 (or 1092803 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 61.

The spelling of 1194218396809 in words is "one trillion, one hundred ninety-four billion, two hundred eighteen million, three hundred ninety-six thousand, eight hundred nine".