9981211 has 2 divisors, whose sum is σ = 9981212. Its totient is φ = 9981210.

The previous prime is 9981199. The next prime is 9981221. The reversal of 9981211 is 1121899.

9981211 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1121899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9981211 - 2⁹ = 9980699 is a prime.

It is not a weakly prime, because it can be changed into another prime (9981221) 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 as a sum of consecutive naturals, namely, 4990605 + 4990606.

It is an arithmetic number, because the mean of its divisors is an integer number (4990606).

Almost surely, 2^9981211 is an apocalyptic number.

9981211 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981211 is an equidigital number, since it uses as much as digits as its factorization.

9981211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 9981211 is about 3159.3054616482. The cubic root of 9981211 is about 215.3084521622.

It can be divided in two parts, 998 and 1211, that added together give a square (2209 = 47²).

The spelling of 9981211 in words is "nine million, nine hundred eighty-one thousand, two hundred eleven".