8181889 has 2 divisors, whose sum is σ = 8181890. Its totient is φ = 8181888.
The previous prime is 8181881. The next prime is 8181893. The reversal of 8181889 is 9881818.
8181889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 7884864 + 297025 = 2808^2 + 545^2 .
It is a cyclic number.
It is not a de Polignac number, because 8181889 - 23 = 8181881 is a prime.
8181889 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (8181881) 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, 4090944 + 4090945.
It is an arithmetic number, because the mean of its divisors is an integer number (4090945).
Almost surely, 28181889 is an apocalyptic number.
It is an amenable number.
8181889 is a deficient number, since it is larger than the sum of its proper divisors (1).
8181889 is an equidigital number, since it uses as much as digits as its factorization.
8181889 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 36864, while the sum is 43.
The square root of 8181889 is about 2860.4001468326. The cubic root of 8181889 is about 201.5043972383.
The spelling of 8181889 in words is "eight million, one hundred eighty-one thousand, eight hundred eighty-nine".
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