82139520971 has 2 divisors, whose sum is σ = 82139520972. Its totient is φ = 82139520970.

The previous prime is 82139520949. The next prime is 82139521031. The reversal of 82139520971 is 17902593128.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82139520971 - 2¹⁰ = 82139519947 is a prime.

It is a super-3 number, since 3×82139520971³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (82139520271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069760485 + 41069760486.

It is an arithmetic number, because the mean of its divisors is an integer number (41069760486).

Almost surely, 2^82139520971 is an apocalyptic number.

82139520971 is a deficient number, since it is larger than the sum of its proper divisors (1).

82139520971 is an equidigital number, since it uses as much as digits as its factorization.

82139520971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 82139520971 in words is "eighty-two billion, one hundred thirty-nine million, five hundred twenty thousand, nine hundred seventy-one".