991124901120 has 576 divisors, whose sum is σ = 3393458611200. Its totient is φ = 245806202880.

The previous prime is 991124901113. The next prime is 991124901187. The reversal of 991124901120 is 21109421199.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2018584075 + ... + 2018584565.

It is an arithmetic number, because the mean of its divisors is an integer number (5891421200).

Almost surely, 2^991124901120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991124901120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696729305600).

991124901120 is an abundant number, since it is smaller than the sum of its proper divisors (2402333710080).

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

991124901120 is a wasteful number, since it uses less digits than its factorization.

991124901120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 991124901120 in words is "nine hundred ninety-one billion, one hundred twenty-four million, nine hundred one thousand, one hundred twenty".