82021619 has 2 divisors, whose sum is σ = 82021620. Its totient is φ = 82021618.

The previous prime is 82021603. The next prime is 82021633. The reversal of 82021619 is 91612028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82021619 - 2⁴ = 82021603 is a prime.

It is a super-2 number, since 2×82021619² = 13455091966762322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 82021591 and 82021600.

It is not a weakly prime, because it can be changed into another prime (82021649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41010809 + 41010810.

It is an arithmetic number, because the mean of its divisors is an integer number (41010810).

Almost surely, 2^82021619 is an apocalyptic number.

82021619 is a deficient number, since it is larger than the sum of its proper divisors (1).

82021619 is an equidigital number, since it uses as much as digits as its factorization.

82021619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 82021619 is about 9056.5787690496. The cubic root of 82021619 is about 434.4863254436.

The spelling of 82021619 in words is "eighty-two million, twenty-one thousand, six hundred nineteen".