8686121 has 2 divisors, whose sum is σ = 8686122. Its totient is φ = 8686120.

The previous prime is 8686103. The next prime is 8686123. The reversal of 8686121 is 1216868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8637721 + 48400 = 2939^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8686121 is a prime.

Together with 8686123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8686123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343060 + 4343061.

It is an arithmetic number, because the mean of its divisors is an integer number (4343061).

Almost surely, 2^8686121 is an apocalyptic number.

It is an amenable number.

8686121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8686121 is an equidigital number, since it uses as much as digits as its factorization.

8686121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 8686121 is about 2947.2225908472. Note that the first 3 decimals coincide. The cubic root of 8686121 is about 205.5615852897.

The spelling of 8686121 in words is "eight million, six hundred eighty-six thousand, one hundred twenty-one".