171623 has 4 divisors (see below), whose sum is σ = 174048. Its totient is φ = 169200.

The previous prime is 171617. The next prime is 171629. The reversal of 171623 is 326171.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (171617) and next prime (171629).

It is a cyclic number.

It is not a de Polignac number, because 171623 - 2⁶ = 171559 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 171595 and 171604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1103 + ... + 1248.

It is an arithmetic number, because the mean of its divisors is an integer number (43512).

2¹⁷¹⁶²³ is an apocalyptic number.

171623 is a deficient number, since it is larger than the sum of its proper divisors (2425).

171623 is an equidigital number, since it uses as much as digits as its factorization.

171623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424.

The product of its digits is 252, while the sum is 20.

The square root of 171623 is about 414.2740638756. The cubic root of 171623 is about 55.5723159801.

Adding to 171623 its reverse (326171), we get a palindrome (497794).

The spelling of 171623 in words is "one hundred seventy-one thousand, six hundred twenty-three".