142857109 has 4 divisors (see below), whose sum is σ = 142946860. Its totient is φ = 142767360.

The previous prime is 142857107. The next prime is 142857133. The reversal of 142857109 is 901758241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70980625 + 71876484 = 8425^2 + 8478^2 .

It is a cyclic number.

It is not a de Polignac number, because 142857109 - 2¹ = 142857107 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 (142857107) 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, 42444 + ... + 45685.

It is an arithmetic number, because the mean of its divisors is an integer number (35736715).

Almost surely, 2^142857109 is an apocalyptic number.

It is an amenable number.

142857109 is a deficient number, since it is larger than the sum of its proper divisors (89751).

142857109 is an equidigital number, since it uses as much as digits as its factorization.

142857109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89750.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 142857109 is about 11952.2846769980. The cubic root of 142857109 is about 522.7579172768.

The spelling of 142857109 in words is "one hundred forty-two million, eight hundred fifty-seven thousand, one hundred nine".