91343318985972 has 144 divisors (see below), whose sum is σ = 242539525283328. Its totient is φ = 28930477181760.

The previous prime is 91343318985953. The next prime is 91343318985979. The reversal of 91343318985972 is 27958981334319.

91343318985972 is a `hidden beast` number, since 9 + 1 + 3 + 433 + 18 + 98 + 5 + 97 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91343318985972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91343318985979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90872443 + ... + 91872125.

It is an arithmetic number, because the mean of its divisors is an integer number (1684302258912).

Almost surely, 2^{91343318985972} is an apocalyptic number.

91343318985972 is a gapful number since it is divisible by the number (92) 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 91343318985972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121269762641664).

91343318985972 is an abundant number, since it is smaller than the sum of its proper divisors (151196206297356).

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

91343318985972 is a wasteful number, since it uses less digits than its factorization.

91343318985972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000450 (or 1000445 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 91343318985972 in words is "ninety-one trillion, three hundred forty-three billion, three hundred eighteen million, nine hundred eighty-five thousand, nine hundred seventy-two".