84106831 has 4 divisors (see below), whose sum is σ = 84456064. Its totient is φ = 83757600.

The previous prime is 84106823. The next prime is 84106843. The reversal of 84106831 is 13860148.

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 84106831 - 2³ = 84106823 is a prime.

It is a super-2 number, since 2×84106831² = 14147918041725122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84106793 and 84106802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84106811) 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, 174255 + ... + 174736.

It is an arithmetic number, because the mean of its divisors is an integer number (21114016).

Almost surely, 2^84106831 is an apocalyptic number.

84106831 is a deficient number, since it is larger than the sum of its proper divisors (349233).

84106831 is a wasteful number, since it uses less digits than its factorization.

84106831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349232.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 84106831 is about 9170.9776469033. The cubic root of 84106831 is about 438.1374974033.

Adding to 84106831 its reverse (13860148), we get a palindrome (97966979).

The spelling of 84106831 in words is "eighty-four million, one hundred six thousand, eight hundred thirty-one".