991189110001 has 8 divisors (see below), whose sum is σ = 1006439772800. Its totient is φ = 976041145728.

The previous prime is 991189109993. The next prime is 991189110011. The reversal of 991189110001 is 100011981199.

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 991189110001 - 2³ = 991189109993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991189110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25655181 + ... + 25693786.

It is an arithmetic number, because the mean of its divisors is an integer number (125804971600).

Almost surely, 2^991189110001 is an apocalyptic number.

It is an amenable number.

991189110001 is a deficient number, since it is larger than the sum of its proper divisors (15250662799).

991189110001 is a wasteful number, since it uses less digits than its factorization.

991189110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51349263.

The product of its (nonzero) digits is 5832, while the sum is 40.

The spelling of 991189110001 in words is "nine hundred ninety-one billion, one hundred eighty-nine million, one hundred ten thousand, one".