91989200912 has 80 divisors (see below), whose sum is σ = 204944418432. Its totient is φ = 39181639680.

The previous prime is 91989200899. The next prime is 91989200917. The reversal of 91989200912 is 21900298919.

It is not an unprimeable number, because it can be changed into a prime (91989200917) 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, 43166087 + ... + 43168217.

Almost surely, 2^91989200912 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 91989200912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102472209216).

91989200912 is an abundant number, since it is smaller than the sum of its proper divisors (112955217520).

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

91989200912 is a wasteful number, since it uses less digits than its factorization.

91989200912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336 (or 4330 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 50.

The spelling of 91989200912 in words is "ninety-one billion, nine hundred eighty-nine million, two hundred thousand, nine hundred twelve".