142109 has 4 divisors (see below), whose sum is σ = 155040. Its totient is φ = 129180.

The previous prime is 142099. The next prime is 142111. The reversal of 142109 is 901241.

It is a happy number.

142109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 901241 = 11 ⋅81931.

It is a cyclic number.

It is not a de Polignac number, because 142109 - 2⁸ = 141853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142109.

It is not an unprimeable number, because it can be changed into a prime (142159) 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, 6449 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (38760).

2¹⁴²¹⁰⁹ is an apocalyptic number.

It is an amenable number.

142109 is a deficient number, since it is larger than the sum of its proper divisors (12931).

142109 is a wasteful number, since it uses less digits than its factorization.

142109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12930.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 142109 is about 376.9734738679. The cubic root of 142109 is about 52.1843799753.

The spelling of 142109 in words is "one hundred forty-two thousand, one hundred nine".