991029722 has 32 divisors (see below), whose sum is σ = 1610016912. Its totient is φ = 455762944.

The previous prime is 991029713. The next prime is 991029749. The reversal of 991029722 is 227920199.

It can be written as a sum of positive squares in 8 ways, for example, as 957840601 + 33189121 = 30949^2 + 5761^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991029722.

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 15 ways as a sum of consecutive naturals, for example, 527048 + ... + 528924.

Almost surely, 2^991029722 is an apocalyptic number.

991029722 is a deficient number, since it is larger than the sum of its proper divisors (618987190).

991029722 is a wasteful number, since it uses less digits than its factorization.

991029722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 991029722 is about 31480.6245490778. The cubic root of 991029722 is about 997.0009218553. Note that the first 3 decimals are identical.

The spelling of 991029722 in words is "nine hundred ninety-one million, twenty-nine thousand, seven hundred twenty-two".