9939091 has 4 divisors (see below), whose sum is σ = 9946072. Its totient is φ = 9932112.

The previous prime is 9939089. The next prime is 9939103. The reversal of 9939091 is 1909399.

9939091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9939091 - 2¹ = 9939089 is a prime.

It is a Duffinian number.

9939091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9939011) 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, 501 + ... + 4486.

It is an arithmetic number, because the mean of its divisors is an integer number (2486518).

Almost surely, 2^9939091 is an apocalyptic number.

9939091 is a deficient number, since it is larger than the sum of its proper divisors (6981).

9939091 is a wasteful number, since it uses less digits than its factorization.

9939091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6980.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 9939091 is about 3152.6323921447. The cubic root of 9939091 is about 215.0051630273.

The spelling of 9939091 in words is "nine million, nine hundred thirty-nine thousand, ninety-one".