991840544 has 24 divisors (see below), whose sum is σ = 1966947948. Its totient is φ = 492298240.

The previous prime is 991840529. The next prime is 991840579. The reversal of 991840544 is 445048199.

It can be written as a sum of positive squares in 2 ways, for example, as 960256144 + 31584400 = 30988^2 + 5620^2 .

It is a junction number, because it is equal to n+sod(n) for n = 991840495 and 991840504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108737 + ... + 117504.

Almost surely, 2^991840544 is an apocalyptic number.

It is an amenable number.

991840544 is a deficient number, since it is larger than the sum of its proper divisors (975107404).

991840544 is a wasteful number, since it uses less digits than its factorization.

991840544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226388 (or 226380 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 991840544 is about 31493.5000277835. The cubic root of 991840544 is about 997.2727502035.

The spelling of 991840544 in words is "nine hundred ninety-one million, eight hundred forty thousand, five hundred forty-four".