8579981 has 2 divisors, whose sum is σ = 8579982. Its totient is φ = 8579980.

The previous prime is 8579939. The next prime is 8579999. The reversal of 8579981 is 1899758.

It is a happy number.

8579981 is digitally balanced in base 2 and base 3, because in such bases 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., 8213956 + 366025 = 2866^2 + 605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8579981 is a prime.

It is a super-2 number, since 2×8579981² = 147232147920722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8579881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4289990 + 4289991.

It is an arithmetic number, because the mean of its divisors is an integer number (4289991).

Almost surely, 2^8579981 is an apocalyptic number.

It is an amenable number.

8579981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8579981 is an equidigital number, since it uses as much as digits as its factorization.

8579981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 8579981 is about 2929.1604599270. The cubic root of 8579981 is about 204.7208653843.

The spelling of 8579981 in words is "eight million, five hundred seventy-nine thousand, nine hundred eighty-one".