91197216 has 108 divisors (see below), whose sum is σ = 285170886. Its totient is φ = 27624960.

The previous prime is 91197209. The next prime is 91197217. The reversal of 91197216 is 61279119.

It can be written as a sum of positive squares in only one way, i.e., 52707600 + 38489616 = 7260^2 + 6204^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91197217) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33540 + ... + 36156.

Almost surely, 2^91197216 is an apocalyptic number.

91197216 is a gapful number since it is divisible by the number (96) 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 91197216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142585443).

91197216 is an abundant number, since it is smaller than the sum of its proper divisors (193973670).

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

91197216 is a wasteful number, since it uses less digits than its factorization.

91197216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2633 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 91197216 is about 9549.7233467782. The cubic root of 91197216 is about 450.1188426856.

The spelling of 91197216 in words is "ninety-one million, one hundred ninety-seven thousand, two hundred sixteen".