82811317 has 4 divisors (see below), whose sum is σ = 82934316. Its totient is φ = 82688320.

The previous prime is 82811299. The next prime is 82811371. The reversal of 82811317 is 71311828.

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 62821476 + 19989841 = 7926^2 + 4471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82811317 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82818317) 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, 60484 + ... + 61837.

It is an arithmetic number, because the mean of its divisors is an integer number (20733579).

Almost surely, 2^82811317 is an apocalyptic number.

It is an amenable number.

82811317 is a deficient number, since it is larger than the sum of its proper divisors (122999).

82811317 is a wasteful number, since it uses less digits than its factorization.

82811317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122998.

The product of its digits is 2688, while the sum is 31.

The square root of 82811317 is about 9100.0723623497. The cubic root of 82811317 is about 435.8762747579.

The spelling of 82811317 in words is "eighty-two million, eight hundred eleven thousand, three hundred seventeen".