171649 has 8 divisors (see below), whose sum is σ = 190080. Its totient is φ = 154176.

The previous prime is 171641. The next prime is 171653. The reversal of 171649 is 946171.

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

It is a cyclic number.

It is not a de Polignac number, because 171649 - 2³ = 171641 is a prime.

It is a Duffinian number.

171649 is a lucky number.

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 7 ways as a sum of consecutive naturals, for example, 172 + ... + 610.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

2¹⁷¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

171649 is a deficient number, since it is larger than the sum of its proper divisors (18431).

171649 is a wasteful number, since it uses less digits than its factorization.

171649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479.

The product of its digits is 1512, while the sum is 28.

The square root of 171649 is about 414.3054428800. The cubic root of 171649 is about 55.5751221449.

It can be divided in two parts, 171 and 649, that added together give a triangular number (820 = T₄₀).

The spelling of 171649 in words is "one hundred seventy-one thousand, six hundred forty-nine".