8201861 has 2 divisors, whose sum is σ = 8201862. Its totient is φ = 8201860.

The previous prime is 8201857. The next prime is 8201873. The reversal of 8201861 is 1681028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6225025 + 1976836 = 2495^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 8201861 - 2² = 8201857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8201861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8201801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100930 + 4100931.

It is an arithmetic number, because the mean of its divisors is an integer number (4100931).

Almost surely, 2^8201861 is an apocalyptic number.

It is an amenable number.

8201861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8201861 is an equidigital number, since it uses as much as digits as its factorization.

8201861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 8201861 is about 2863.8891389158. The cubic root of 8201861 is about 201.6682214969.

Adding to 8201861 its reverse (1681028), we get a palindrome (9882889).

The spelling of 8201861 in words is "eight million, two hundred one thousand, eight hundred sixty-one".