82685531 has 4 divisors (see below), whose sum is σ = 82706064. Its totient is φ = 82665000.

The previous prime is 82685527. The next prime is 82685543. The reversal of 82685531 is 13558628.

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 82685531 - 2² = 82685527 is a prime.

It is a super-2 number, since 2×82685531² = 13673794073503922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82685591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015 + ... + 13016.

It is an arithmetic number, because the mean of its divisors is an integer number (20676516).

Almost surely, 2^82685531 is an apocalyptic number.

82685531 is a deficient number, since it is larger than the sum of its proper divisors (20533).

82685531 is a wasteful number, since it uses less digits than its factorization.

82685531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20532.

The product of its digits is 57600, while the sum is 38.

The square root of 82685531 is about 9093.1584721702. The cubic root of 82685531 is about 435.6554719402.

The spelling of 82685531 in words is "eighty-two million, six hundred eighty-five thousand, five hundred thirty-one".