609139 has 4 divisors (see below), whose sum is σ = 612400. Its totient is φ = 605880.

The previous prime is 609113. The next prime is 609143. The reversal of 609139 is 931906.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 609139 - 2⁵ = 609107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609149) 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, 1332 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (153100).

2⁶⁰⁹¹³⁹ is an apocalyptic number.

609139 is a deficient number, since it is larger than the sum of its proper divisors (3261).

609139 is a wasteful number, since it uses less digits than its factorization.

609139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 609139 is about 780.4735741843. The cubic root of 609139 is about 84.7693400345.

The spelling of 609139 in words is "six hundred nine thousand, one hundred thirty-nine".