82139671 has 2 divisors, whose sum is σ = 82139672. Its totient is φ = 82139670.

The previous prime is 82139669. The next prime is 82139683. The reversal of 82139671 is 17693128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82139671 - 2¹ = 82139669 is a prime.

Together with 82139669, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 82139671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82139171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069835 + 41069836.

It is an arithmetic number, because the mean of its divisors is an integer number (41069836).

Almost surely, 2^82139671 is an apocalyptic number.

82139671 is a deficient number, since it is larger than the sum of its proper divisors (1).

82139671 is an equidigital number, since it uses as much as digits as its factorization.

82139671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 82139671 is about 9063.0938977813. The cubic root of 82139671 is about 434.6946745437.

The spelling of 82139671 in words is "eighty-two million, one hundred thirty-nine thousand, six hundred seventy-one".