91288197 has 48 divisors (see below), whose sum is σ = 177061248. Its totient is φ = 43770240.

The previous prime is 91288187. The next prime is 91288229. The reversal of 91288197 is 79188219.

It is not a de Polignac number, because 91288197 - 2⁶ = 91288133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91288117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3943 + ... + 14075.

It is an arithmetic number, because the mean of its divisors is an integer number (3688776).

Almost surely, 2^91288197 is an apocalyptic number.

It is an amenable number.

91288197 is a deficient number, since it is larger than the sum of its proper divisors (85773051).

91288197 is a wasteful number, since it uses less digits than its factorization.

91288197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10170 (or 10167 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 91288197 is about 9554.4857004446. The cubic root of 91288197 is about 450.2684768278.

The spelling of 91288197 in words is "ninety-one million, two hundred eighty-eight thousand, one hundred ninety-seven".