84120811 has 4 divisors (see below), whose sum is σ = 89069112. Its totient is φ = 79172512.

The previous prime is 84120791. The next prime is 84120899. The reversal of 84120811 is 11802148.

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 84120811 - 2⁹ = 84120299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84121811) 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, 2474125 + ... + 2474158.

It is an arithmetic number, because the mean of its divisors is an integer number (22267278).

Almost surely, 2^84120811 is an apocalyptic number.

84120811 is a deficient number, since it is larger than the sum of its proper divisors (4948301).

84120811 is a wasteful number, since it uses less digits than its factorization.

84120811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948300.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 84120811 is about 9171.7398022404. The cubic root of 84120811 is about 438.1617713844.

Adding to 84120811 its reverse (11802148), we get a palindrome (95922959).

The spelling of 84120811 in words is "eighty-four million, one hundred twenty thousand, eight hundred eleven".