91197120 has 224 divisors, whose sum is σ = 340010496. Its totient is φ = 20275200.

The previous prime is 91197107. The next prime is 91197121. The reversal of 91197120 is 2179119.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (91197121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275355 + ... + 275685.

It is an arithmetic number, because the mean of its divisors is an integer number (1517904).

Almost surely, 2^91197120 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 91197120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170005248).

91197120 is an abundant number, since it is smaller than the sum of its proper divisors (248813376).

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

91197120 is a wasteful number, since it uses less digits than its factorization.

91197120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 91197120 is about 9549.7183204532. The cubic root of 91197120 is about 450.1186847443.

The spelling of 91197120 in words is "ninety-one million, one hundred ninety-seven thousand, one hundred twenty".