609851 has 4 divisors (see below), whose sum is σ = 665304. Its totient is φ = 554400.

The previous prime is 609821. The next prime is 609859. The reversal of 609851 is 158906.

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

It is not a de Polignac number, because 609851 - 2¹⁸ = 347707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609859) 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, 27710 + ... + 27731.

It is an arithmetic number, because the mean of its divisors is an integer number (166326).

2⁶⁰⁹⁸⁵¹ is an apocalyptic number.

609851 is a deficient number, since it is larger than the sum of its proper divisors (55453).

609851 is a wasteful number, since it uses less digits than its factorization.

609851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55452.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 609851 is about 780.9295742895. The cubic root of 609851 is about 84.8023550877.

The spelling of 609851 in words is "six hundred nine thousand, eight hundred fifty-one".