8118181 has 2 divisors, whose sum is σ = 8118182. Its totient is φ = 8118180.

The previous prime is 8118179. The next prime is 8118191. The reversal of 8118181 is 1818118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 1069156 = 2655^2 + 1034^2 .

It is a cyclic number.

It is not a de Polignac number, because 8118181 - 2¹ = 8118179 is a prime.

It is a super-2 number, since 2×8118181² = 131809725497522, which contains 22 as substring.

Together with 8118179, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8118101) 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, 4059090 + 4059091.

It is an arithmetic number, because the mean of its divisors is an integer number (4059091).

Almost surely, 2^8118181 is an apocalyptic number.

It is an amenable number.

8118181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8118181 is an equidigital number, since it uses as much as digits as its factorization.

8118181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 28.

The square root of 8118181 is about 2849.2421799489. The cubic root of 8118181 is about 200.9800315138.

The spelling of 8118181 in words is "eight million, one hundred eighteen thousand, one hundred eighty-one".