609381 has 6 divisors (see below), whose sum is σ = 880230. Its totient is φ = 406248.

The previous prime is 609379. The next prime is 609391. The reversal of 609381 is 183906.

It can be written as a sum of positive squares in only one way, i.e., 349281 + 260100 = 591^2 + 510^2 .

It is not a de Polignac number, because 609381 - 2¹ = 609379 is a prime.

It is a super-2 number, since 2×609381² = 742690406322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33846 + ... + 33863.

It is an arithmetic number, because the mean of its divisors is an integer number (146705).

2⁶⁰⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

609381 is a deficient number, since it is larger than the sum of its proper divisors (270849).

609381 is a wasteful number, since it uses less digits than its factorization.

609381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67715 (or 67712 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 609381 is about 780.6285928660. The cubic root of 609381 is about 84.7805643277.

It can be divided in two parts, 609 and 381, that added together give a triangular number (990 = T₄₄).

The spelling of 609381 in words is "six hundred nine thousand, three hundred eighty-one".