1212109 has 4 divisors (see below), whose sum is σ = 1218400. Its totient is φ = 1205820.

The previous prime is 1212103. The next prime is 1212119. The reversal of 1212109 is 9012121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212109 - 2⁹ = 1211597 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212092 and 1212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212103) 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 in 3 ways as a sum of consecutive naturals, for example, 2847 + ... + 3244.

It is an arithmetic number, because the mean of its divisors is an integer number (304600).

2^1212109 is an apocalyptic number.

It is an amenable number.

1212109 is a deficient number, since it is larger than the sum of its proper divisors (6291).

1212109 is an equidigital number, since it uses as much as digits as its factorization.

1212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1212109 is about 1100.9582190074. The cubic root of 1212109 is about 106.6220983512.

It can be divided in two parts, 12 and 12109, that added together give a palindrome (12121).

The spelling of 1212109 in words is "one million, two hundred twelve thousand, one hundred nine".