82139899 has 2 divisors, whose sum is σ = 82139900. Its totient is φ = 82139898.

The previous prime is 82139833. The next prime is 82139909. The reversal of 82139899 is 99893128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82139899 - 2¹¹ = 82137851 is a prime.

It is not a weakly prime, because it can be changed into another prime (82130899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069949 + 41069950.

It is an arithmetic number, because the mean of its divisors is an integer number (41069950).

Almost surely, 2^82139899 is an apocalyptic number.

82139899 is a deficient number, since it is larger than the sum of its proper divisors (1).

82139899 is an equidigital number, since it uses as much as digits as its factorization.

82139899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 82139899 is about 9063.1064762586. The cubic root of 82139899 is about 434.6950767460.

It can be divided in two parts, 82139 and 899, that added together give a palindrome (83038).

The spelling of 82139899 in words is "eighty-two million, one hundred thirty-nine thousand, eight hundred ninety-nine".