84231131 has 4 divisors (see below), whose sum is σ = 84592872. Its totient is φ = 83869392.

The previous prime is 84231101. The next prime is 84231137. The reversal of 84231131 is 13113248.

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-84231131 is a prime.

It is a super-2 number, since 2×84231131² = 14189766859078322, 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 = 84231097 and 84231106.

It is not an unprimeable number, because it can be changed into a prime (84231137) 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, 180521 + ... + 180986.

It is an arithmetic number, because the mean of its divisors is an integer number (21148218).

Almost surely, 2^84231131 is an apocalyptic number.

84231131 is a deficient number, since it is larger than the sum of its proper divisors (361741).

84231131 is a wasteful number, since it uses less digits than its factorization.

84231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361740.

The product of its digits is 576, while the sum is 23.

The square root of 84231131 is about 9177.7519578598. The cubic root of 84231131 is about 438.3532297188.

Adding to 84231131 its reverse (13113248), we get a palindrome (97344379).

The spelling of 84231131 in words is "eighty-four million, two hundred thirty-one thousand, one hundred thirty-one".