82158317 has 2 divisors, whose sum is σ = 82158318. Its totient is φ = 82158316.

The previous prime is 82158311. The next prime is 82158319. The reversal of 82158317 is 71385128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78340201 + 3818116 = 8851^2 + 1954^2 .

It is a cyclic number.

It is not a de Polignac number, because 82158317 - 2⁸ = 82158061 is a prime.

Together with 82158319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82158311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41079158 + 41079159.

It is an arithmetic number, because the mean of its divisors is an integer number (41079159).

Almost surely, 2^82158317 is an apocalyptic number.

It is an amenable number.

82158317 is a deficient number, since it is larger than the sum of its proper divisors (1).

82158317 is an equidigital number, since it uses as much as digits as its factorization.

82158317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 82158317 is about 9064.1225168242. The cubic root of 82158317 is about 434.7275644720.

The spelling of 82158317 in words is "eighty-two million, one hundred fifty-eight thousand, three hundred seventeen".