9991391010 has 32 divisors (see below), whose sum is σ = 24307827840. Its totient is φ = 2627872128.

The previous prime is 9991390999. The next prime is 9991391017. The reversal of 9991391010 is 101931999.

It is not an unprimeable number, because it can be changed into a prime (9991391017) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2278950 + ... + 2283329.

It is an arithmetic number, because the mean of its divisors is an integer number (759619620).

Almost surely, 2^9991391010 is an apocalyptic number.

9991391010 is an abundant number, since it is smaller than the sum of its proper divisors (14316436830).

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

9991391010 is a wasteful number, since it uses less digits than its factorization.

9991391010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562362.

The product of its (nonzero) digits is 19683, while the sum is 42.

The square root of 9991391010 is about 99956.9457816714. The cubic root of 9991391010 is about 2153.8162623066.

The spelling of 9991391010 in words is "nine billion, nine hundred ninety-one million, three hundred ninety-one thousand, ten".