121109 has 4 divisors (see below), whose sum is σ = 122016. Its totient is φ = 120204.

The previous prime is 121081. The next prime is 121123. The reversal of 121109 is 901121.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 901121 = 13 ⋅69317.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121093 and 121102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209 + ... + 534.

It is an arithmetic number, because the mean of its divisors is an integer number (30504).

2¹²¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

121109 is a deficient number, since it is larger than the sum of its proper divisors (907).

121109 is an equidigital number, since it uses as much as digits as its factorization.

121109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 121109 is about 348.0071838339. The cubic root of 121109 is about 49.4757218630.

The spelling of 121109 in words is "one hundred twenty-one thousand, one hundred nine".