991485927000 has 896 divisors, whose sum is σ = 3645979384320. Its totient is φ = 251942400000.

The previous prime is 991485926971. The next prime is 991485927049. The reversal of 991485927000 is 729584199.

991485927000 is a `hidden beast` number, since 9 + 9 + 1 + 48 + 592 + 7 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 1649726700 + ... + 1649727300.

It is an arithmetic number, because the mean of its divisors is an integer number (4069173420).

Almost surely, 2^991485927000 is an apocalyptic number.

991485927000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991485927000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822989692160).

991485927000 is an abundant number, since it is smaller than the sum of its proper divisors (2654493457320).

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

991485927000 is a wasteful number, since it uses less digits than its factorization.

991485927000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 991485927000 in words is "nine hundred ninety-one billion, four hundred eighty-five million, nine hundred twenty-seven thousand".