91118320 has 20 divisors (see below), whose sum is σ = 211850280. Its totient is φ = 36447296.

The previous prime is 91118303. The next prime is 91118327. The reversal of 91118320 is 2381119.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91118327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569410 + ... + 569569.

It is an arithmetic number, because the mean of its divisors is an integer number (10592514).

Almost surely, 2^91118320 is an apocalyptic number.

It is an amenable number.

91118320 is an abundant number, since it is smaller than the sum of its proper divisors (120731960).

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

91118320 is a wasteful number, since it uses less digits than its factorization.

91118320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138992 (or 1138986 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 91118320 is about 9545.5916526950. The cubic root of 91118320 is about 449.9890038465.

Adding to 91118320 its reverse (2381119), we get a palindrome (93499439).

It can be divided in two parts, 91 and 118320, that multiplied together give a triangular number (10767120 = T₄₆₄₀).

The spelling of 91118320 in words is "ninety-one million, one hundred eighteen thousand, three hundred twenty".