171643 has 4 divisors (see below), whose sum is σ = 176320. Its totient is φ = 166968.

The previous prime is 171641. The next prime is 171653. The reversal of 171643 is 346171.

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

It is a cyclic number.

It is not a de Polignac number, because 171643 - 2¹ = 171641 is a prime.

It is a super-2 number, since 2×171643² = 58922638898, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (171641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283 + ... + 2356.

It is an arithmetic number, because the mean of its divisors is an integer number (44080).

2¹⁷¹⁶⁴³ is an apocalyptic number.

171643 is a deficient number, since it is larger than the sum of its proper divisors (4677).

171643 is an equidigital number, since it uses as much as digits as its factorization.

171643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676.

The product of its digits is 504, while the sum is 22.

The square root of 171643 is about 414.2982017822. The cubic root of 171643 is about 55.5744745936.

The spelling of 171643 in words is "one hundred seventy-one thousand, six hundred forty-three".