82385021 has 2 divisors, whose sum is σ = 82385022. Its totient is φ = 82385020.

The previous prime is 82384999. The next prime is 82385029. The reversal of 82385021 is 12058328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 29822521 = 7250^2 + 5461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82385021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_4800476 and since 82385021 and 4800476 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82385029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41192510 + 41192511.

It is an arithmetic number, because the mean of its divisors is an integer number (41192511).

Almost surely, 2^82385021 is an apocalyptic number.

It is an amenable number.

82385021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82385021 is an equidigital number, since it uses as much as digits as its factorization.

82385021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 82385021 is about 9076.6194698247. The cubic root of 82385021 is about 435.1270532117.

The spelling of 82385021 in words is "eighty-two million, three hundred eighty-five thousand, twenty-one".