84861871 has 2 divisors, whose sum is σ = 84861872. Its totient is φ = 84861870.

The previous prime is 84861857. The next prime is 84861877. The reversal of 84861871 is 17816848.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84861871 - 2¹¹ = 84859823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84861877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42430935 + 42430936.

It is an arithmetic number, because the mean of its divisors is an integer number (42430936).

Almost surely, 2^84861871 is an apocalyptic number.

84861871 is a deficient number, since it is larger than the sum of its proper divisors (1).

84861871 is an equidigital number, since it uses as much as digits as its factorization.

84861871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 84861871 is about 9212.0503146694. The cubic root of 84861871 is about 439.4446695833. Note that the first 3 decimals are identical.

The spelling of 84861871 in words is "eighty-four million, eight hundred sixty-one thousand, eight hundred seventy-one".