1109881 has 2 divisors, whose sum is σ = 1109882.
Its totient is φ = 1109880.
The previous prime is 1109869. The next prime is 1109887. The reversal of 1109881 is 1889011.
Subtracting from 1109881 its product of nonzero digits (576), we obtain a triangular number (1109305 = T1489).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1010025 + 99856 = 1005^2 + 316^2
It is an emirp because it is prime and its reverse (1889011) is a distict prime.
It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1886011 and 1106881.
It is a cyclic number.
It is not a de Polignac number, because 1109881 - 213 = 1101689 is a prime.
It is a super-3 number, since 3×11098813 = 4101573562363334523, which contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1109887) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554940 + 554941.
It is an arithmetic number, because the mean of its divisors is an integer number (554941).
21109881 is an apocalyptic number.
It is an amenable number.
1109881 is a deficient number, since it is larger than the sum of its proper divisors (1).
1109881 is an equidigital number, since it uses as much as digits as its factorization.
1109881 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 576, while the sum is 28.
The square root of 1109881 is about 1053.5088988708.
The cubic root of 1109881 is about 103.5361803388.
The spelling of 1109881 in words is "one million, one hundred nine thousand, eight hundred eighty-one".