991190119922 has 4 divisors (see below), whose sum is σ = 1486785179886. Its totient is φ = 495595059960.

The previous prime is 991190119921. The next prime is 991190119949. The reversal of 991190119922 is 229911091199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 229911091199 = 2333 ⋅98547403.

It can be written as a sum of positive squares in only one way, i.e., 823990092121 + 167200027801 = 907739^2 + 408901^2 .

It is not an unprimeable number, because it can be changed into a prime (991190119921) 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 as a sum of consecutive naturals, namely, 247797529979 + ... + 247797529982.

Almost surely, 2^991190119922 is an apocalyptic number.

991190119922 is a deficient number, since it is larger than the sum of its proper divisors (495595059964).

991190119922 is a wasteful number, since it uses less digits than its factorization.

991190119922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495595059963.

The product of its (nonzero) digits is 236196, while the sum is 53.

The spelling of 991190119922 in words is "nine hundred ninety-one billion, one hundred ninety million, one hundred nineteen thousand, nine hundred twenty-two".