82131317 has 2 divisors, whose sum is σ = 82131318. Its totient is φ = 82131316.

The previous prime is 82131311. The next prime is 82131341. The reversal of 82131317 is 71313128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80174116 + 1957201 = 8954^2 + 1399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82131317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82131311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41065658 + 41065659.

It is an arithmetic number, because the mean of its divisors is an integer number (41065659).

Almost surely, 2^82131317 is an apocalyptic number.

It is an amenable number.

82131317 is a deficient number, since it is larger than the sum of its proper divisors (1).

82131317 is an equidigital number, since it uses as much as digits as its factorization.

82131317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 82131317 is about 9062.6330059205. The cubic root of 82131317 is about 434.6799371970.

The spelling of 82131317 in words is "eighty-two million, one hundred thirty-one thousand, three hundred seventeen".