82105817 has 4 divisors (see below), whose sum is σ = 83451876. Its totient is φ = 80759760.

The previous prime is 82105799. The next prime is 82105823. The reversal of 82105817 is 71850128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2468041 + 79637776 = 1571^2 + 8924^2 .

It is a cyclic number.

It is not a de Polignac number, because 82105817 - 2¹⁴ = 82089433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82105417) 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, 672938 + ... + 673059.

It is an arithmetic number, because the mean of its divisors is an integer number (20862969).

Almost surely, 2^82105817 is an apocalyptic number.

It is an amenable number.

82105817 is a deficient number, since it is larger than the sum of its proper divisors (1346059).

82105817 is a wasteful number, since it uses less digits than its factorization.

82105817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346058.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82105817 is about 9061.2260207987. The cubic root of 82105817 is about 434.6349462965.

The spelling of 82105817 in words is "eighty-two million, one hundred five thousand, eight hundred seventeen".