173661 has 8 divisors (see below), whose sum is σ = 234144. Its totient is φ = 114480.

The previous prime is 173659. The next prime is 173669. The reversal of 173661 is 166371.

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

It is not a de Polignac number, because 173661 - 2¹ = 173659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 591.

It is an arithmetic number, because the mean of its divisors is an integer number (29268).

2¹⁷³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

173661 is a deficient number, since it is larger than the sum of its proper divisors (60483).

173661 is a wasteful number, since it uses less digits than its factorization.

173661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

The product of its digits is 756, while the sum is 24.

The square root of 173661 is about 416.7265290331. The cubic root of 173661 is about 55.7914222243.

The spelling of 173661 in words is "one hundred seventy-three thousand, six hundred sixty-one".