8785981 has 2 divisors, whose sum is σ = 8785982. Its totient is φ = 8785980.

The previous prime is 8785963. The next prime is 8785993. The reversal of 8785981 is 1895878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 549081 = 2870^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 8785981 - 2⁷ = 8785853 is a prime.

It is a super-2 number, since 2×8785981² = 154386924264722, which contains 22 as substring.

8785981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8785951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4392990 + 4392991.

It is an arithmetic number, because the mean of its divisors is an integer number (4392991).

Almost surely, 2^8785981 is an apocalyptic number.

It is an amenable number.

8785981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8785981 is an equidigital number, since it uses as much as digits as its factorization.

8785981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 46.

The square root of 8785981 is about 2964.1155510540. The cubic root of 8785981 is about 206.3463319817.

It can be divided in two parts, 878 and 5981, that added together give a cube (6859 = 19³).

The spelling of 8785981 in words is "eight million, seven hundred eighty-five thousand, nine hundred eighty-one".