8207861 has 2 divisors, whose sum is σ = 8207862. Its totient is φ = 8207860.

The previous prime is 8207851. The next prime is 8207873. The reversal of 8207861 is 1687028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7187761 + 1020100 = 2681^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 8207861 - 2²² = 4013557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8207851) 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, 4103930 + 4103931.

It is an arithmetic number, because the mean of its divisors is an integer number (4103931).

Almost surely, 2^8207861 is an apocalyptic number.

It is an amenable number.

8207861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8207861 is an equidigital number, since it uses as much as digits as its factorization.

8207861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 8207861 is about 2864.9364739903. The cubic root of 8207861 is about 201.7173857208.

The spelling of 8207861 in words is "eight million, two hundred seven thousand, eight hundred sixty-one".