84871121 has 4 divisors (see below), whose sum is σ = 86844912. Its totient is φ = 82897332.

The previous prime is 84871103. The next prime is 84871133. The reversal of 84871121 is 12117848.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84871121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84871151) 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 in 3 ways as a sum of consecutive naturals, for example, 986831 + ... + 986916.

It is an arithmetic number, because the mean of its divisors is an integer number (21711228).

Almost surely, 2^84871121 is an apocalyptic number.

It is an amenable number.

84871121 is a deficient number, since it is larger than the sum of its proper divisors (1973791).

84871121 is a wasteful number, since it uses less digits than its factorization.

84871121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973790.

The product of its digits is 3584, while the sum is 32.

The square root of 84871121 is about 9212.5523607739. The cubic root of 84871121 is about 439.4606355897.

Adding to 84871121 its reverse (12117848), we get a palindrome (96988969).

The spelling of 84871121 in words is "eighty-four million, eight hundred seventy-one thousand, one hundred twenty-one".