84661871 has 4 divisors (see below), whose sum is σ = 96756432. Its totient is φ = 72567312.

The previous prime is 84661831. The next prime is 84661879. The reversal of 84661871 is 17816648.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84661871 - 2⁶ = 84661807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84661879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6047270 + ... + 6047283.

It is an arithmetic number, because the mean of its divisors is an integer number (24189108).

Almost surely, 2^84661871 is an apocalyptic number.

84661871 is a deficient number, since it is larger than the sum of its proper divisors (12094561).

84661871 is a wasteful number, since it uses less digits than its factorization.

84661871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12094560.

The product of its digits is 64512, while the sum is 41.

The square root of 84661871 is about 9201.1885645280. The cubic root of 84661871 is about 439.0991745331.

The spelling of 84661871 in words is "eighty-four million, six hundred sixty-one thousand, eight hundred seventy-one".