844000981 has 2 divisors, whose sum is σ = 844000982. Its totient is φ = 844000980.

The previous prime is 844000951. The next prime is 844000987. The reversal of 844000981 is 189000448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503598481 + 340402500 = 22441^2 + 18450^2 .

It is a cyclic number.

It is not a de Polignac number, because 844000981 - 2¹³ = 843992789 is a prime.

It is a super-2 number, since 2×844000981² = 1424675311857924722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844000987) 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, 422000490 + 422000491.

It is an arithmetic number, because the mean of its divisors is an integer number (422000491).

Almost surely, 2^844000981 is an apocalyptic number.

It is an amenable number.

844000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

844000981 is an equidigital number, since it uses as much as digits as its factorization.

844000981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 844000981 is about 29051.6949763693. The cubic root of 844000981 is about 945.0344718349.

The spelling of 844000981 in words is "eight hundred forty-four million, nine hundred eighty-one", and thus it is an aban number.