9991288554 has 32 divisors (see below), whose sum is σ = 21822804864. Its totient is φ = 3030941760.

The previous prime is 9991288523. The next prime is 9991288583. The reversal of 9991288554 is 4558821999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896529 + ... + 907604.

It is an arithmetic number, because the mean of its divisors is an integer number (681962652).

Almost surely, 2^9991288554 is an apocalyptic number.

9991288554 is an abundant number, since it is smaller than the sum of its proper divisors (11831516310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991288554 is a wasteful number, since it uses less digits than its factorization.

9991288554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804222.

The product of its digits is 9331200, while the sum is 60.

The square root of 9991288554 is about 99956.4332797044. The cubic root of 9991288554 is about 2153.8089002301.

The spelling of 9991288554 in words is "nine billion, nine hundred ninety-one million, two hundred eighty-eight thousand, five hundred fifty-four".