609181 has 8 divisors (see below), whose sum is σ = 644864. Its totient is φ = 574560.

The previous prime is 609179. The next prime is 609199. The reversal of 609181 is 181906.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 609181 - 2¹ = 609179 is a prime.

It is a super-2 number, since 2×609181² = 742202981522, which contains 22 as substring.

It is the 781-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609101) by changing a digit.

It is a nontrivial repunit in base 780.

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 7 ways as a sum of consecutive naturals, for example, 1105 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (80608).

2⁶⁰⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

609181 is a deficient number, since it is larger than the sum of its proper divisors (35683).

609181 is a wasteful number, since it uses less digits than its factorization.

609181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 609181 is about 780.5004804611. The cubic root of 609181 is about 84.7712882655.

The spelling of 609181 in words is "six hundred nine thousand, one hundred eighty-one".