91491210272 has 96 divisors (see below), whose sum is σ = 224659370880. Its totient is φ = 35631636480.

The previous prime is 91491210263. The next prime is 91491210277. The reversal of 91491210272 is 27201219419.

It is not an unprimeable number, because it can be changed into a prime (91491210277) 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, 7802558 + ... + 7814274.

It is an arithmetic number, because the mean of its divisors is an integer number (2340201780).

Almost surely, 2^91491210272 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 91491210272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112329685440).

91491210272 is an abundant number, since it is smaller than the sum of its proper divisors (133168160608).

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

91491210272 is a wasteful number, since it uses less digits than its factorization.

91491210272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14914 (or 14906 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 91491210272 in words is "ninety-one billion, four hundred ninety-one million, two hundred ten thousand, two hundred seventy-two".