8266861 has 2 divisors, whose sum is σ = 8266862. Its totient is φ = 8266860.

The previous prime is 8266859. The next prime is 8266889. The reversal of 8266861 is 1686628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7733961 + 532900 = 2781^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 8266861 - 2¹ = 8266859 is a prime.

Together with 8266859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8266861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8266891) 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, 4133430 + 4133431.

It is an arithmetic number, because the mean of its divisors is an integer number (4133431).

Almost surely, 2^8266861 is an apocalyptic number.

It is an amenable number.

8266861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8266861 is an equidigital number, since it uses as much as digits as its factorization.

8266861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 8266861 is about 2875.2149484865. The cubic root of 8266861 is about 202.1995626079.

The spelling of 8266861 in words is "eight million, two hundred sixty-six thousand, eight hundred sixty-one".