1169116728821 has 4 divisors (see below), whose sum is σ = 1169123930700. Its totient is φ = 1169109526944.

The previous prime is 1169116728817. The next prime is 1169116728827. The reversal of 1169116728821 is 1288276119611.

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 895320933796 + 273795795025 = 946214^2 + 523255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1169116728821 - 2² = 1169116728817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1169116728827) 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 3 ways as a sum of consecutive naturals, for example, 3351686 + ... + 3684023.

It is an arithmetic number, because the mean of its divisors is an integer number (292280982675).

Almost surely, 2^{1169116728821} is an apocalyptic number.

It is an amenable number.

1169116728821 is a deficient number, since it is larger than the sum of its proper divisors (7201879).

1169116728821 is an equidigital number, since it uses as much as digits as its factorization.

1169116728821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7201878.

The product of its digits is 580608, while the sum is 53.

The spelling of 1169116728821 in words is "one trillion, one hundred sixty-nine billion, one hundred sixteen million, seven hundred twenty-eight thousand, eight hundred twenty-one".