171551 has 4 divisors (see below), whose sum is σ = 180600. Its totient is φ = 162504.

The previous prime is 171541. The next prime is 171553. The reversal of 171551 is 155171.

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 171551 - 2¹⁴ = 155167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171553) 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, 4496 + ... + 4533.

It is an arithmetic number, because the mean of its divisors is an integer number (45150).

2¹⁷¹⁵⁵¹ is an apocalyptic number.

171551 is a deficient number, since it is larger than the sum of its proper divisors (9049).

171551 is an equidigital number, since it uses as much as digits as its factorization.

171551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048.

The product of its digits is 175, while the sum is 20.

The square root of 171551 is about 414.1871557642. The cubic root of 171551 is about 55.5645435828.

The spelling of 171551 in words is "one hundred seventy-one thousand, five hundred fifty-one".