8206981 has 2 divisors, whose sum is σ = 8206982. Its totient is φ = 8206980.

The previous prime is 8206969. The next prime is 8206987. The reversal of 8206981 is 1896028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6974881 + 1232100 = 2641^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 8206981 - 2⁷ = 8206853 is a prime.

It is a super-2 number, since 2×8206981² = 134709074268722, which contains 22 as substring.

It is an Ulam number.

8206981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8206987) 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, 4103490 + 4103491.

It is an arithmetic number, because the mean of its divisors is an integer number (4103491).

Almost surely, 2^8206981 is an apocalyptic number.

It is an amenable number.

8206981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8206981 is an equidigital number, since it uses as much as digits as its factorization.

8206981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 8206981 is about 2864.7828888068. The cubic root of 8206981 is about 201.7101764676.

The spelling of 8206981 in words is "eight million, two hundred six thousand, nine hundred eighty-one".