9899091 has 28 divisors (see below), whose sum is σ = 15284512. Its totient is φ = 6403536.

The previous prime is 9899069. The next prime is 9899119. The reversal of 9899091 is 1909989.

It is not a de Polignac number, because 9899091 - 2¹³ = 9890899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9899041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 26790 + ... + 27156.

Almost surely, 2^9899091 is an apocalyptic number.

9899091 is a deficient number, since it is larger than the sum of its proper divisors (5385421).

9899091 is an equidigital number, since it uses as much as digits as its factorization.

9899091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 9899091 is about 3146.2820916123. The cubic root of 9899091 is about 214.7163448781.

The spelling of 9899091 in words is "nine million, eight hundred ninety-nine thousand, ninety-one".