8371861 has 2 divisors, whose sum is σ = 8371862. Its totient is φ = 8371860.

The previous prime is 8371819. The next prime is 8371897. The reversal of 8371861 is 1681738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 2640625 = 2394^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 8371861 - 2⁷ = 8371733 is a prime.

8371861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8371061) 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, 4185930 + 4185931.

It is an arithmetic number, because the mean of its divisors is an integer number (4185931).

Almost surely, 2^8371861 is an apocalyptic number.

It is an amenable number.

8371861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8371861 is an equidigital number, since it uses as much as digits as its factorization.

8371861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 8371861 is about 2893.4168382727. The cubic root of 8371861 is about 203.0520303106.

The spelling of 8371861 in words is "eight million, three hundred seventy-one thousand, eight hundred sixty-one".