8121871 has 2 divisors, whose sum is σ = 8121872. Its totient is φ = 8121870.

The previous prime is 8121851. The next prime is 8121877. The reversal of 8121871 is 1781218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121871 - 2¹¹ = 8119823 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060935 + 4060936.

It is an arithmetic number, because the mean of its divisors is an integer number (4060936).

Almost surely, 2^8121871 is an apocalyptic number.

8121871 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121871 is an equidigital number, since it uses as much as digits as its factorization.

8121871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 28.

The square root of 8121871 is about 2849.8896469864. The cubic root of 8121871 is about 201.0104777423.

It can be divided in two parts, 81 and 21871, that added together give a cube (21952 = 28³).

The spelling of 8121871 in words is "eight million, one hundred twenty-one thousand, eight hundred seventy-one".