9991401848 has 64 divisors (see below), whose sum is σ = 20403835200. Its totient is φ = 4573803520.

The previous prime is 9991401841. The next prime is 9991401907. The reversal of 9991401848 is 8481041999.

It is a Cunningham number, because it is equal to 99957²-1.

It is a super-2 number, since 2×9991401848² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 9991401848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991401841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387338 + ... + 412326.

It is an arithmetic number, because the mean of its divisors is an integer number (318809925).

Almost surely, 2^9991401848 is an apocalyptic number.

It is an amenable number.

9991401848 is an abundant number, since it is smaller than the sum of its proper divisors (10412433352).

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

9991401848 is a wasteful number, since it uses less digits than its factorization.

9991401848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25112 (or 25108 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 9991401848 is about 99956.9999949978. Note that the first 5 decimals coincide. The cubic root of 9991401848 is about 2153.8170410788.

The spelling of 9991401848 in words is "nine billion, nine hundred ninety-one million, four hundred one thousand, eight hundred forty-eight".