91172016 has 120 divisors (see below), whose sum is σ = 277857216. Its totient is φ = 27740160.

The previous prime is 91172009. The next prime is 91172041. The reversal of 91172016 is 61027119.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211321 + ... + 211751.

Almost surely, 2^91172016 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 91172016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138928608).

91172016 is an abundant number, since it is smaller than the sum of its proper divisors (186685200).

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

91172016 is a wasteful number, since it uses less digits than its factorization.

91172016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 91172016 is about 9548.4038456697. The cubic root of 91172016 is about 450.0773792862.

It can be divided in two parts, 911 and 72016, that added together give a palindrome (72927).

The spelling of 91172016 in words is "ninety-one million, one hundred seventy-two thousand, sixteen".