991099119901 has 8 divisors (see below), whose sum is σ = 1081262721024. Its totient is φ = 900946132320.

The previous prime is 991099119889. The next prime is 991099119911. The reversal of 991099119901 is 109911990199.

It is a happy number.

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 991099119901 - 2¹⁵ = 991099087133 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 (991099119911) 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 7 ways as a sum of consecutive naturals, for example, 2457501 + ... + 2832226.

It is an arithmetic number, because the mean of its divisors is an integer number (135157840128).

Almost surely, 2^991099119901 is an apocalyptic number.

It is an amenable number.

991099119901 is a deficient number, since it is larger than the sum of its proper divisors (90163601123).

991099119901 is a wasteful number, since it uses less digits than its factorization.

991099119901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306771.

The product of its (nonzero) digits is 531441, while the sum is 58.

The spelling of 991099119901 in words is "nine hundred ninety-one billion, ninety-nine million, one hundred nineteen thousand, nine hundred one".