82085009 has 4 divisors (see below), whose sum is σ = 82576704. Its totient is φ = 81593316.

The previous prime is 82084987. The next prime is 82085011. The reversal of 82085009 is 90058028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82085009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82085039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245597 + ... + 245930.

It is an arithmetic number, because the mean of its divisors is an integer number (20644176).

Almost surely, 2^82085009 is an apocalyptic number.

It is an amenable number.

82085009 is a deficient number, since it is larger than the sum of its proper divisors (491695).

82085009 is a wasteful number, since it uses less digits than its factorization.

82085009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491694.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 82085009 is about 9060.0777590482. The cubic root of 82085009 is about 434.5982268191.

The spelling of 82085009 in words is "eighty-two million, eighty-five thousand, nine".