8171861 has 2 divisors, whose sum is σ = 8171862. Its totient is φ = 8171860.

The previous prime is 8171851. The next prime is 8171869. The reversal of 8171861 is 1681718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6791236 + 1380625 = 2606^2 + 1175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8171861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8171869) 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, 4085930 + 4085931.

It is an arithmetic number, because the mean of its divisors is an integer number (4085931).

Almost surely, 2^8171861 is an apocalyptic number.

It is an amenable number.

8171861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8171861 is an equidigital number, since it uses as much as digits as its factorization.

8171861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 32.

The square root of 8171861 is about 2858.6467077972. The cubic root of 8171861 is about 201.4220400468.

The spelling of 8171861 in words is "eight million, one hundred seventy-one thousand, eight hundred sixty-one".