991922 has 8 divisors (see below), whose sum is σ = 1503516. Its totient is φ = 490752.

The previous prime is 991909. The next prime is 991927. The reversal of 991922 is 229199.

991922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 863041 + 128881 = 929^2 + 359^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (991927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 2750.

2⁹⁹¹⁹²² is an apocalyptic number.

991922 is a deficient number, since it is larger than the sum of its proper divisors (511594).

991922 is a wasteful number, since it uses less digits than its factorization.

991922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212.

The product of its digits is 2916, while the sum is 32.

The square root of 991922 is about 995.9528101271. The cubic root of 991922 is about 99.7300050165.

The spelling of 991922 in words is "nine hundred ninety-one thousand, nine hundred twenty-two".