82886821 has 2 divisors, whose sum is σ = 82886822. Its totient is φ = 82886820.

The previous prime is 82886807. The next prime is 82886827. The reversal of 82886821 is 12868828.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61449921 + 21436900 = 7839^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 82886821 - 2⁷ = 82886693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82886827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41443410 + 41443411.

It is an arithmetic number, because the mean of its divisors is an integer number (41443411).

Almost surely, 2^82886821 is an apocalyptic number.

It is an amenable number.

82886821 is a deficient number, since it is larger than the sum of its proper divisors (1).

82886821 is an equidigital number, since it uses as much as digits as its factorization.

82886821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98304, while the sum is 43.

The square root of 82886821 is about 9104.2199556030. The cubic root of 82886821 is about 436.0087059536.

The spelling of 82886821 in words is "eighty-two million, eight hundred eighty-six thousand, eight hundred twenty-one".