127109 has 4 divisors (see below), whose sum is σ = 134604. Its totient is φ = 119616.

The previous prime is 127103. The next prime is 127123. The reversal of 127109 is 901721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901721 = 19 ⋅47459.

It can be written as a sum of positive squares in 2 ways, for example, as 112225 + 14884 = 335^2 + 122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127109 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127103) 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, 3722 + ... + 3755.

It is an arithmetic number, because the mean of its divisors is an integer number (33651).

2¹²⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

127109 is a deficient number, since it is larger than the sum of its proper divisors (7495).

127109 is an equidigital number, since it uses as much as digits as its factorization.

127109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7494.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 127109 is about 356.5234915121. The cubic root of 127109 is about 50.2796331901.

The spelling of 127109 in words is "one hundred twenty-seven thousand, one hundred nine".