9840091 has 2 divisors, whose sum is σ = 9840092. Its totient is φ = 9840090.

The previous prime is 9840073. The next prime is 9840101. The reversal of 9840091 is 1900489.

It is a strong prime.

It is an emirp because it is prime and its reverse (1900489) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9840091 is a prime.

It is not a weakly prime, because it can be changed into another prime (9840001) 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, 4920045 + 4920046.

It is an arithmetic number, because the mean of its divisors is an integer number (4920046).

Almost surely, 2^9840091 is an apocalyptic number.

9840091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9840091 is an equidigital number, since it uses as much as digits as its factorization.

9840091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9840091 is about 3136.8919331083. The cubic root of 9840091 is about 214.2889145131.

The spelling of 9840091 in words is "nine million, eight hundred forty thousand, ninety-one".