9020111981 has 2 divisors, whose sum is σ = 9020111982. Its totient is φ = 9020111980.

The previous prime is 9020111953. The next prime is 9020112011. The reversal of 9020111981 is 1891110209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7185274756 + 1834837225 = 84766^2 + 42835^2 .

It is a cyclic number.

It is not a de Polignac number, because 9020111981 - 2¹⁴ = 9020095597 is a prime.

It is a super-2 number, since 2×9020111981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9020141981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510055990 + 4510055991.

It is an arithmetic number, because the mean of its divisors is an integer number (4510055991).

Almost surely, 2^9020111981 is an apocalyptic number.

It is an amenable number.

9020111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9020111981 is an equidigital number, since it uses as much as digits as its factorization.

9020111981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 9020111981 is about 94974.2700998539. The cubic root of 9020111981 is about 2081.6321001946.

The spelling of 9020111981 in words is "nine billion, twenty million, one hundred eleven thousand, nine hundred eighty-one".