991017422 has 16 divisors (see below), whose sum is σ = 1552050720. Its totient is φ = 473692032.

The previous prime is 991017389. The next prime is 991017457. The reversal of 991017422 is 224710199.

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 in 7 ways as a sum of consecutive naturals, for example, 90938 + ... + 101250.

It is an arithmetic number, because the mean of its divisors is an integer number (97003170).

Almost surely, 2^991017422 is an apocalyptic number.

991017422 is a deficient number, since it is larger than the sum of its proper divisors (561033298).

991017422 is a wasteful number, since it uses less digits than its factorization.

991017422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12427.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 991017422 is about 31480.4291902128. The cubic root of 991017422 is about 996.9967971347.

The spelling of 991017422 in words is "nine hundred ninety-one million, seventeen thousand, four hundred twenty-two".