82339581 has 16 divisors (see below), whose sum is σ = 112907520. Its totient is φ = 53352000.

The previous prime is 82339571. The next prime is 82339589. The reversal of 82339581 is 18593328.

It is a de Polignac number, because none of the positive numbers 2^k-82339581 is a prime.

It is a super-2 number, since 2×82339581² = 13559613198511122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82339589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14956 + ... + 19706.

It is an arithmetic number, because the mean of its divisors is an integer number (7056720).

Almost surely, 2^82339581 is an apocalyptic number.

It is an amenable number.

82339581 is a deficient number, since it is larger than the sum of its proper divisors (30567939).

82339581 is a wasteful number, since it uses less digits than its factorization.

82339581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916.

The product of its digits is 51840, while the sum is 39.

The square root of 82339581 is about 9074.1159900015. The cubic root of 82339581 is about 435.0470394368.

It can be divided in two parts, 823 and 39581, that added together give a palindrome (40404).

The spelling of 82339581 in words is "eighty-two million, three hundred thirty-nine thousand, five hundred eighty-one".