9918091 has 2 divisors, whose sum is σ = 9918092. Its totient is φ = 9918090.

The previous prime is 9918059. The next prime is 9918121. The reversal of 9918091 is 1908199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9918091 - 2⁵ = 9918059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9918091.

It is not a weakly prime, because it can be changed into another prime (9918991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959045 + 4959046.

It is an arithmetic number, because the mean of its divisors is an integer number (4959046).

Almost surely, 2^9918091 is an apocalyptic number.

9918091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9918091 is an equidigital number, since it uses as much as digits as its factorization.

9918091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 9918091 is about 3149.3000809704. The cubic root of 9918091 is about 214.8536303198.

The spelling of 9918091 in words is "nine million, nine hundred eighteen thousand, ninety-one".