82739542009 has 2 divisors, whose sum is σ = 82739542010. Its totient is φ = 82739542008.

The previous prime is 82739542001. The next prime is 82739542019. The reversal of 82739542009 is 90024593728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82582666384 + 156875625 = 287372^2 + 12525^2 .

It is a cyclic number.

It is not a de Polignac number, because 82739542009 - 2³ = 82739542001 is a prime.

It is not a weakly prime, because it can be changed into another prime (82739542001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41369771004 + 41369771005.

It is an arithmetic number, because the mean of its divisors is an integer number (41369771005).

Almost surely, 2^82739542009 is an apocalyptic number.

It is an amenable number.

82739542009 is a deficient number, since it is larger than the sum of its proper divisors (1).

82739542009 is an equidigital number, since it uses as much as digits as its factorization.

82739542009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 82739542009 in words is "eighty-two billion, seven hundred thirty-nine million, five hundred forty-two thousand, nine".