82139520949 has 2 divisors, whose sum is σ = 82139520950. Its totient is φ = 82139520948.

The previous prime is 82139520923. The next prime is 82139520971. The reversal of 82139520949 is 94902593128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74534460100 + 7605060849 = 273010^2 + 87207^2 .

It is a cyclic number.

It is not a de Polignac number, because 82139520949 - 2⁷ = 82139520821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82139520896 and 82139520905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82139520349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069760474 + 41069760475.

It is an arithmetic number, because the mean of its divisors is an integer number (41069760475).

Almost surely, 2^82139520949 is an apocalyptic number.

It is an amenable number.

82139520949 is a deficient number, since it is larger than the sum of its proper divisors (1).

82139520949 is an equidigital number, since it uses as much as digits as its factorization.

82139520949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 82139520949 in words is "eighty-two billion, one hundred thirty-nine million, five hundred twenty thousand, nine hundred forty-nine".