82335821 has 2 divisors, whose sum is σ = 82335822. Its totient is φ = 82335820.

The previous prime is 82335817. The next prime is 82335823. The reversal of 82335821 is 12853328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69122596 + 13213225 = 8314^2 + 3635^2 .

It is a cyclic number.

It is not a de Polignac number, because 82335821 - 2² = 82335817 is a prime.

It is a Sophie Germain prime.

Together with 82335823, 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 (82335823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41167910 + 41167911.

It is an arithmetic number, because the mean of its divisors is an integer number (41167911).

Almost surely, 2^82335821 is an apocalyptic number.

It is an amenable number.

82335821 is a deficient number, since it is larger than the sum of its proper divisors (1).

82335821 is an equidigital number, since it uses as much as digits as its factorization.

82335821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 82335821 is about 9073.9088049197. The cubic root of 82335821 is about 435.0404172601.

The spelling of 82335821 in words is "eighty-two million, three hundred thirty-five thousand, eight hundred twenty-one".