84042031 has 4 divisors (see below), whose sum is σ = 84083392. Its totient is φ = 84000672.

The previous prime is 84042011. The next prime is 84042083. The reversal of 84042031 is 13024048.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84042031 is a prime.

It is a super-2 number, since 2×84042031² = 14126125949209922, 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 = 84041993 and 84042011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84042001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17466 + ... + 21751.

It is an arithmetic number, because the mean of its divisors is an integer number (21020848).

Almost surely, 2^84042031 is an apocalyptic number.

84042031 is a deficient number, since it is larger than the sum of its proper divisors (41361).

84042031 is a wasteful number, since it uses less digits than its factorization.

84042031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41360.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 84042031 is about 9167.4440821856. Note that the first 3 decimals coincide. The cubic root of 84042031 is about 438.0249476696.

Adding to 84042031 its reverse (13024048), we get a palindrome (97066079).

The spelling of 84042031 in words is "eighty-four million, forty-two thousand, thirty-one".