9991922 has 8 divisors (see below), whose sum is σ = 15233772.
Its totient is φ = 4914000.
The previous prime is 9991879. The next prime is 9991939. The reversal of 9991922 is 2291999.
It is a Cunningham number, because it is equal to 31612+1.
It can be written as a sum of positive squares in 2 ways, for example, as 9991921 + 1 = 3161^2 + 1^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a self number, because there is not a number n which added to its sum of digits gives 9991922.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40829 + ... + 41072.
Almost surely, 29991922 is an apocalyptic number.
9991922 is a deficient number, since it is larger than the sum of its proper divisors (5241850).
9991922 is a wasteful number, since it uses less digits than its factorization.
9991922 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 81964.
The product of its digits is 26244, while the sum is 41.
The square root of 9991922 is about 3161.0001581778.
Note that the first 3 decimals coincide.
The cubic root of 9991922 is about 215.3854416308.
It can be divided in two parts, 9 and 991922, that multiplied together give a palindrome (8927298).
The spelling of 9991922 in words is "nine million, nine hundred ninety-one thousand, nine hundred twenty-two".