609881 has 4 divisors (see below), whose sum is σ = 642000. Its totient is φ = 577764.

The previous prime is 609877. The next prime is 609887. The reversal of 609881 is 188906.

609881 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.

It is a cyclic number.

It is not a de Polignac number, because 609881 - 2² = 609877 is a prime.

It is a super-2 number, since 2×609881² = 743909668322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (609887) 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, 16031 + ... + 16068.

It is an arithmetic number, because the mean of its divisors is an integer number (160500).

2⁶⁰⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

609881 is a deficient number, since it is larger than the sum of its proper divisors (32119).

609881 is a wasteful number, since it uses less digits than its factorization.

609881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32118.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 609881 is about 780.9487819313. The cubic root of 609881 is about 84.8037456071.

The spelling of 609881 in words is "six hundred nine thousand, eight hundred eighty-one".