126109 has 4 divisors (see below), whose sum is σ = 131616. Its totient is φ = 120604.

The previous prime is 126107. The next prime is 126127. The reversal of 126109 is 901621.

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 126109 - 2¹ = 126107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126107) 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 in 3 ways as a sum of consecutive naturals, for example, 2719 + ... + 2764.

It is an arithmetic number, because the mean of its divisors is an integer number (32904).

2¹²⁶¹⁰⁹ is an apocalyptic number.

It is an amenable number.

126109 is a deficient number, since it is larger than the sum of its proper divisors (5507).

126109 is an equidigital number, since it uses as much as digits as its factorization.

126109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 126109 is about 355.1182901513. The cubic root of 126109 is about 50.1474315183.

The spelling of 126109 in words is "one hundred twenty-six thousand, one hundred nine".