171949 has 4 divisors (see below), whose sum is σ = 173664. Its totient is φ = 170236.

The previous prime is 171947. The next prime is 172001. The reversal of 171949 is 949171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171949 - 2¹ = 171947 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171947) 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, 697 + ... + 910.

It is an arithmetic number, because the mean of its divisors is an integer number (43416).

2¹⁷¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

171949 is a deficient number, since it is larger than the sum of its proper divisors (1715).

171949 is a wasteful number, since it uses less digits than its factorization.

171949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714.

The product of its digits is 2268, while the sum is 31.

The square root of 171949 is about 414.6673365482. The cubic root of 171949 is about 55.6074804903.

It can be divided in two parts, 17 and 1949, that multiplied together give a palindrome (33133).

The spelling of 171949 in words is "one hundred seventy-one thousand, nine hundred forty-nine".