91008906 has 16 divisors (see below), whose sum is σ = 182153664. Its totient is φ = 30313664.

The previous prime is 91008893. The next prime is 91008913. The reversal of 91008906 is 60980019.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4435 + ... + 14201.

It is an arithmetic number, because the mean of its divisors is an integer number (11384604).

Almost surely, 2^91008906 is an apocalyptic number.

91008906 is an abundant number, since it is smaller than the sum of its proper divisors (91144758).

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

91008906 is a wasteful number, since it uses less digits than its factorization.

91008906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11325.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 91008906 is about 9539.8588039866. The cubic root of 91008906 is about 449.8088175531.

The spelling of 91008906 in words is "ninety-one million, eight thousand, nine hundred six".