1097818109 has 2 divisors, whose sum is σ = 1097818110. Its totient is φ = 1097818108.
The previous prime is 1097818069. The next prime is 1097818147. The reversal of 1097818109 is 9018187901.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 938503225 + 159314884 = 30635^2 + 12622^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1097818109 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 1097818109.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1097818199) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548909054 + 548909055.
It is an arithmetic number, because the mean of its divisors is an integer number (548909055).
Almost surely, 21097818109 is an apocalyptic number.
It is an amenable number.
1097818109 is a deficient number, since it is larger than the sum of its proper divisors (1).
1097818109 is an equidigital number, since it uses as much as digits as its factorization.
1097818109 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 36288, while the sum is 44.
The square root of 1097818109 is about 33133.3383316562. The cubic root of 1097818109 is about 1031.5971416608.
The spelling of 1097818109 in words is "one billion, ninety-seven million, eight hundred eighteen thousand, one hundred nine".
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