1091399479179 has 4 divisors (see below), whose sum is σ = 1455199305576. Its totient is φ = 727599652784.

The previous prime is 1091399479151. The next prime is 1091399479189. The reversal of 1091399479179 is 9719749931901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1091399479179 - 2¹⁵ = 1091399446411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091399479189) 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, 181899913194 + ... + 181899913199.

It is an arithmetic number, because the mean of its divisors is an integer number (363799826394).

Almost surely, 2^{1091399479179} is an apocalyptic number.

1091399479179 is a deficient number, since it is larger than the sum of its proper divisors (363799826397).

1091399479179 is an equidigital number, since it uses as much as digits as its factorization.

1091399479179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363799826396.

The product of its (nonzero) digits is 34720812, while the sum is 69.

The spelling of 1091399479179 in words is "one trillion, ninety-one billion, three hundred ninety-nine million, four hundred seventy-nine thousand, one hundred seventy-nine".