1213109 has 2 divisors, whose sum is σ = 1213110. Its totient is φ = 1213108.

The previous prime is 1213097. The next prime is 1213129. The reversal of 1213109 is 9013121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 442225 = 878^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213109 - 2⁸ = 1212853 is a prime.

It is a super-3 number, since 3×1213109³ = 5355755333697762087, which contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606554 + 606555.

It is an arithmetic number, because the mean of its divisors is an integer number (606555).

2^1213109 is an apocalyptic number.

It is an amenable number.

1213109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213109 is an equidigital number, since it uses as much as digits as its factorization.

1213109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1213109 is about 1101.4122752176. The cubic root of 1213109 is about 106.6514116639.

The spelling of 1213109 in words is "one million, two hundred thirteen thousand, one hundred nine".