82823581 has 2 divisors, whose sum is σ = 82823582. Its totient is φ = 82823580.

The previous prime is 82823579. The next prime is 82823593. The reversal of 82823581 is 18532828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80371225 + 2452356 = 8965^2 + 1566^2 .

It is a cyclic number.

It is not a de Polignac number, because 82823581 - 2¹ = 82823579 is a prime.

It is a super-2 number, since 2×82823581² = 13719491139327122, which contains 22 as substring.

Together with 82823579, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82823581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82823561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41411790 + 41411791.

It is an arithmetic number, because the mean of its divisors is an integer number (41411791).

Almost surely, 2^82823581 is an apocalyptic number.

It is an amenable number.

82823581 is a deficient number, since it is larger than the sum of its proper divisors (1).

82823581 is an equidigital number, since it uses as much as digits as its factorization.

82823581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 37.

The square root of 82823581 is about 9100.7461781988. The cubic root of 82823581 is about 435.8977908298.

The spelling of 82823581 in words is "eighty-two million, eight hundred twenty-three thousand, five hundred eighty-one".