91118372 has 12 divisors (see below), whose sum is σ = 159523980. Its totient is φ = 45540096.

The previous prime is 91118371. The next prime is 91118389. The reversal of 91118372 is 27381119.

It can be written as a sum of positive squares in 2 ways, for example, as 4553956 + 86564416 = 2134^2 + 9304^2 .

It is not an unprimeable number, because it can be changed into a prime (91118371) 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, 16508 + ... + 21324.

It is an arithmetic number, because the mean of its divisors is an integer number (13293665).

Almost surely, 2^91118372 is an apocalyptic number.

It is an amenable number.

91118372 is a deficient number, since it is larger than the sum of its proper divisors (68405608).

91118372 is a wasteful number, since it uses less digits than its factorization.

91118372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550 (or 9548 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 91118372 is about 9545.5943764650. The cubic root of 91118372 is about 449.9890894474.

The spelling of 91118372 in words is "ninety-one million, one hundred eighteen thousand, three hundred seventy-two".