84731581 has 12 divisors (see below), whose sum is σ = 93974076. Its totient is φ = 76334720.

The previous prime is 84731579. The next prime is 84731593. The reversal of 84731581 is 18513748.

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 71554681 = 3630^2 + 8459^2 .

It is not a de Polignac number, because 84731581 - 2¹ = 84731579 is a prime.

It is a super-2 number, since 2×84731581² = 14358881637519122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84731581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84731531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10575 + ... + 16771.

It is an arithmetic number, because the mean of its divisors is an integer number (7831173).

Almost surely, 2^84731581 is an apocalyptic number.

It is an amenable number.

84731581 is a deficient number, since it is larger than the sum of its proper divisors (9242495).

84731581 is a wasteful number, since it uses less digits than its factorization.

84731581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332 (or 6321 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 84731581 is about 9204.9758826409. The cubic root of 84731581 is about 439.2196585467.

The spelling of 84731581 in words is "eighty-four million, seven hundred thirty-one thousand, five hundred eighty-one".