991299120001 has 8 divisors (see below), whose sum is σ = 1014520598784. Its totient is φ = 968085278160.

The previous prime is 991299119981. The next prime is 991299120109. The reversal of 991299120001 is 100021992199.

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

It is not a de Polignac number, because 991299120001 - 2⁷ = 991299119873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991299120001.

It is not an unprimeable number, because it can be changed into a prime (991299126001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646170 + ... + 2166211.

It is an arithmetic number, because the mean of its divisors is an integer number (126815074848).

Almost surely, 2^991299120001 is an apocalyptic number.

It is an amenable number.

991299120001 is a deficient number, since it is larger than the sum of its proper divisors (23221478783).

991299120001 is a wasteful number, since it uses less digits than its factorization.

991299120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818471.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 991299120001 in words is "nine hundred ninety-one billion, two hundred ninety-nine million, one hundred twenty thousand, one".