991120822013 has 8 divisors (see below), whose sum is σ = 1132728407232. Its totient is φ = 849517960896.

The previous prime is 991120821871. The next prime is 991120822073. The reversal of 991120822013 is 310228021199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991120822013 - 2¹² = 991120817917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991120822073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719420 + ... + 1581077.

It is an arithmetic number, because the mean of its divisors is an integer number (141591050904).

Almost surely, 2^991120822013 is an apocalyptic number.

It is an amenable number.

991120822013 is a deficient number, since it is larger than the sum of its proper divisors (141607585219).

991120822013 is a wasteful number, since it uses less digits than its factorization.

991120822013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362051.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 991120822013 in words is "nine hundred ninety-one billion, one hundred twenty million, eight hundred twenty-two thousand, thirteen".