82021349 has 2 divisors, whose sum is σ = 82021350. Its totient is φ = 82021348.

The previous prime is 82021307. The next prime is 82021351. The reversal of 82021349 is 94312028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77757124 + 4264225 = 8818^2 + 2065^2 .

It is a cyclic number.

It is not a de Polignac number, because 82021349 - 2¹⁶ = 81955813 is a prime.

It is a Sophie Germain prime.

Together with 82021351, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82021399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41010674 + 41010675.

It is an arithmetic number, because the mean of its divisors is an integer number (41010675).

Almost surely, 2^82021349 is an apocalyptic number.

It is an amenable number.

82021349 is a deficient number, since it is larger than the sum of its proper divisors (1).

82021349 is an equidigital number, since it uses as much as digits as its factorization.

82021349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 82021349 is about 9056.5638627462. The cubic root of 82021349 is about 434.4858486936.

The spelling of 82021349 in words is "eighty-two million, twenty-one thousand, three hundred forty-nine".