609918871 has 4 divisors (see below), whose sum is σ = 610188544. Its totient is φ = 609649200.

The previous prime is 609918857. The next prime is 609918887. The reversal of 609918871 is 178819906.

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 609918871 - 2⁹ = 609918359 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 (609918271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131415 + ... + 135976.

It is an arithmetic number, because the mean of its divisors is an integer number (152547136).

Almost surely, 2^609918871 is an apocalyptic number.

609918871 is a deficient number, since it is larger than the sum of its proper divisors (269673).

609918871 is a wasteful number, since it uses less digits than its factorization.

609918871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269672.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 609918871 is about 24696.5356072466. The cubic root of 609918871 is about 848.0550088730.

The spelling of 609918871 in words is "six hundred nine million, nine hundred eighteen thousand, eight hundred seventy-one".