82471209 has 4 divisors (see below), whose sum is σ = 109961616. Its totient is φ = 54980804.

The previous prime is 82471201. The next prime is 82471211. The reversal of 82471209 is 90217428.

It is a happy number.

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 not a de Polignac number, because 82471209 - 2³ = 82471201 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 82471209.

It is not an unprimeable number, because it can be changed into a prime (82471201) 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, 13745199 + ... + 13745204.

It is an arithmetic number, because the mean of its divisors is an integer number (27490404).

Almost surely, 2^82471209 is an apocalyptic number.

It is an amenable number.

82471209 is a deficient number, since it is larger than the sum of its proper divisors (27490407).

82471209 is a wasteful number, since it uses less digits than its factorization.

82471209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27490406.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 82471209 is about 9081.3660316056. The cubic root of 82471209 is about 435.2787379866.

The spelling of 82471209 in words is "eighty-two million, four hundred seventy-one thousand, two hundred nine".