82821239 has 2 divisors, whose sum is σ = 82821240. Its totient is φ = 82821238.

The previous prime is 82821227. The next prime is 82821251. The reversal of 82821239 is 93212828.

It is a balanced prime because it is at equal distance from previous prime (82821227) and next prime (82821251).

It is a cyclic number.

It is not a de Polignac number, because 82821239 - 2⁴ = 82821223 is a prime.

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 = 82821199 and 82821208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82821259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41410619 + 41410620.

It is an arithmetic number, because the mean of its divisors is an integer number (41410620).

Almost surely, 2^82821239 is an apocalyptic number.

82821239 is a deficient number, since it is larger than the sum of its proper divisors (1).

82821239 is an equidigital number, since it uses as much as digits as its factorization.

82821239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 82821239 is about 9100.6175065212. The cubic root of 82821239 is about 435.8936821680.

The spelling of 82821239 in words is "eighty-two million, eight hundred twenty-one thousand, two hundred thirty-nine".