818282581 has 2 divisors, whose sum is σ = 818282582. Its totient is φ = 818282580.

The previous prime is 818282579. The next prime is 818282611. The reversal of 818282581 is 185282818.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555356356 + 262926225 = 23566^2 + 16215^2 .

It is a cyclic number.

It is not a de Polignac number, because 818282581 - 2¹ = 818282579 is a prime.

It is a super-2 number, since 2×818282581² = 1339172764736043122, which contains 22 as substring.

Together with 818282579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818282081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409141290 + 409141291.

It is an arithmetic number, because the mean of its divisors is an integer number (409141291).

Almost surely, 2^818282581 is an apocalyptic number.

It is an amenable number.

818282581 is a deficient number, since it is larger than the sum of its proper divisors (1).

818282581 is an equidigital number, since it uses as much as digits as its factorization.

818282581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81920, while the sum is 43.

The square root of 818282581 is about 28605.6389720628. The cubic root of 818282581 is about 935.3362554670.

The spelling of 818282581 in words is "eight hundred eighteen million, two hundred eighty-two thousand, five hundred eighty-one".