1109531 has 2 divisors, whose sum is σ = 1109532.
Its totient is φ = 1109530.
The previous prime is 1109513. The next prime is 1109533. The reversal of 1109531 is 1359011.
Together with previous prime (1109513) it forms an Ormiston pair, because they use the same digits, order apart.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1109531 - 210 = 1108507 is a prime.
It is a super-2 number, since 2×11095312 = 2462118079922, which contains 22 as substring.
Together with 1109533, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1109533) 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, 554765 + 554766.
It is an arithmetic number, because the mean of its divisors is an integer number (554766).
21109531 is an apocalyptic number.
1109531 is a deficient number, since it is larger than the sum of its proper divisors (1).
1109531 is an equidigital number, since it uses as much as digits as its factorization.
1109531 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 135, while the sum is 20.
The square root of 1109531 is about 1053.3427742193.
The cubic root of 1109531 is about 103.5252958467.
The spelling of 1109531 in words is "one million, one hundred nine thousand, five hundred thirty-one".