91099120 has 40 divisors (see below), whose sum is σ = 242064864. Its totient is φ = 31233792.

The previous prime is 91099097. The next prime is 91099123. The reversal of 91099120 is 2199019.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91099123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80779 + ... + 81898.

Almost surely, 2^91099120 is an apocalyptic number.

It is an amenable number.

91099120 is an abundant number, since it is smaller than the sum of its proper divisors (150965744).

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

91099120 is a wasteful number, since it uses less digits than its factorization.

91099120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162697 (or 162691 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 91099120 is about 9544.5858998701. The cubic root of 91099120 is about 449.9573951434.

It can be divided in two parts, 91099 and 120, that added together give a palindrome (91219).

The spelling of 91099120 in words is "ninety-one million, ninety-nine thousand, one hundred twenty".