82209811 has 4 divisors (see below), whose sum is σ = 82240912. Its totient is φ = 82178712.

The previous prime is 82209791. The next prime is 82209857. The reversal of 82209811 is 11890228.

It is a happy number.

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 82209811 - 2¹⁷ = 82078739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82209011) 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, 11175 + ... + 17008.

It is an arithmetic number, because the mean of its divisors is an integer number (20560228).

Almost surely, 2^82209811 is an apocalyptic number.

82209811 is a deficient number, since it is larger than the sum of its proper divisors (31101).

82209811 is a wasteful number, since it uses less digits than its factorization.

82209811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31100.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 82209811 is about 9066.9626115916. The cubic root of 82209811 is about 434.8183695857.

The spelling of 82209811 in words is "eighty-two million, two hundred nine thousand, eight hundred eleven".