173609381 has 16 divisors (see below), whose sum is σ = 192380928. Its totient is φ = 155358000.

The previous prime is 173609377. The next prime is 173609407. The reversal of 173609381 is 183906371.

It is a cyclic number.

It is not a de Polignac number, because 173609381 - 2² = 173609377 is a prime.

It is a super-3 number, since 3×173609381³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173609311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210536 + ... + 211358.

It is an arithmetic number, because the mean of its divisors is an integer number (12023808).

Almost surely, 2^173609381 is an apocalyptic number.

173609381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

173609381 is a deficient number, since it is larger than the sum of its proper divisors (18771547).

173609381 is a wasteful number, since it uses less digits than its factorization.

173609381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 173609381 is about 13176.0912641041. The cubic root of 173609381 is about 557.8589386196.

The spelling of 173609381 in words is "one hundred seventy-three million, six hundred nine thousand, three hundred eighty-one".