9108220981 has 2 divisors, whose sum is σ = 9108220982. Its totient is φ = 9108220980.

The previous prime is 9108220967. The next prime is 9108220987. The reversal of 9108220981 is 1890228019.

9108220981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8315798481 + 792422500 = 91191^2 + 28150^2 .

It is an emirp because it is prime and its reverse (1890228019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9108220981 - 2²⁹ = 8571350069 is a prime.

It is a super-2 number, since 2×9108220981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9108220987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4554110490 + 4554110491.

It is an arithmetic number, because the mean of its divisors is an integer number (4554110491).

Almost surely, 2^9108220981 is an apocalyptic number.

It is an amenable number.

9108220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9108220981 is an equidigital number, since it uses as much as digits as its factorization.

9108220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 9108220981 is about 95437.0000628687. Note that the first 4 decimals coincide. The cubic root of 9108220981 is about 2088.3879865423.

The spelling of 9108220981 in words is "nine billion, one hundred eight million, two hundred twenty thousand, nine hundred eighty-one".