9205981 has 2 divisors, whose sum is σ = 9205982. Its totient is φ = 9205980.

The previous prime is 9205969. The next prime is 9206011. The reversal of 9205981 is 1895029.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 737881 = 2910^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 9205981 - 2¹⁹ = 8681693 is a prime.

It is a super-2 number, since 2×9205981² = 169500172344722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9205951) 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, 4602990 + 4602991.

It is an arithmetic number, because the mean of its divisors is an integer number (4602991).

Almost surely, 2^9205981 is an apocalyptic number.

It is an amenable number.

9205981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9205981 is an equidigital number, since it uses as much as digits as its factorization.

9205981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 9205981 is about 3034.1359560837. The cubic root of 9205981 is about 209.5833082705.

The spelling of 9205981 in words is "nine million, two hundred five thousand, nine hundred eighty-one".