991443422 has 4 divisors (see below), whose sum is σ = 1487165136. Its totient is φ = 495721710.

The previous prime is 991443419. The next prime is 991443433. The reversal of 991443422 is 224344199.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×991443422³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 247860854 + ... + 247860857.

It is an arithmetic number, because the mean of its divisors is an integer number (371791284).

Almost surely, 2^991443422 is an apocalyptic number.

991443422 is a deficient number, since it is larger than the sum of its proper divisors (495721714).

991443422 is a wasteful number, since it uses less digits than its factorization.

991443422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495721713.

The product of its digits is 62208, while the sum is 38.

The square root of 991443422 is about 31487.1945717620. The cubic root of 991443422 is about 997.1396334373.

The spelling of 991443422 in words is "nine hundred ninety-one million, four hundred forty-three thousand, four hundred twenty-two".