9802210091 has 2 divisors, whose sum is σ = 9802210092. Its totient is φ = 9802210090.

The previous prime is 9802210079. The next prime is 9802210141. The reversal of 9802210091 is 1900122089.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1900122089) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9802210091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9802210001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4901105045 + 4901105046.

It is an arithmetic number, because the mean of its divisors is an integer number (4901105046).

Almost surely, 2^9802210091 is an apocalyptic number.

9802210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9802210091 is an equidigital number, since it uses as much as digits as its factorization.

9802210091 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 32.

The square root of 9802210091 is about 99006.1113820758. Note that the first 3 decimals coincide. The cubic root of 9802210091 is about 2140.1358177258.

The spelling of 9802210091 in words is "nine billion, eight hundred two million, two hundred ten thousand, ninety-one".