82491239 has 2 divisors, whose sum is σ = 82491240. Its totient is φ = 82491238.

The previous prime is 82491229. The next prime is 82491257. The reversal of 82491239 is 93219428.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82491239 - 2⁴ = 82491223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82491209) 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, 41245619 + 41245620.

It is an arithmetic number, because the mean of its divisors is an integer number (41245620).

Almost surely, 2^82491239 is an apocalyptic number.

82491239 is a deficient number, since it is larger than the sum of its proper divisors (1).

82491239 is an equidigital number, since it uses as much as digits as its factorization.

82491239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 82491239 is about 9082.4687723108. The cubic root of 82491239 is about 435.3139742324.

The spelling of 82491239 in words is "eighty-two million, four hundred ninety-one thousand, two hundred thirty-nine".