818266181 has 2 divisors, whose sum is σ = 818266182. Its totient is φ = 818266180.

The previous prime is 818266177. The next prime is 818266201. The reversal of 818266181 is 181662818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651985156 + 166281025 = 25534^2 + 12895^2 .

It is a cyclic number.

It is not a de Polignac number, because 818266181 - 2² = 818266177 is a prime.

It is a super-2 number, since 2×818266181² = 1339119085936649522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818266481) 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, 409133090 + 409133091.

It is an arithmetic number, because the mean of its divisors is an integer number (409133091).

Almost surely, 2^818266181 is an apocalyptic number.

It is an amenable number.

818266181 is a deficient number, since it is larger than the sum of its proper divisors (1).

818266181 is an equidigital number, since it uses as much as digits as its factorization.

818266181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 818266181 is about 28605.3523138590. The cubic root of 818266181 is about 935.3300067630.

The spelling of 818266181 in words is "eight hundred eighteen million, two hundred sixty-six thousand, one hundred eighty-one".