171903 has 4 divisors (see below), whose sum is σ = 229208. Its totient is φ = 114600.

The previous prime is 171889. The next prime is 171917. The reversal of 171903 is 309171.

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 (171889) and next prime (171917).

It is not a de Polignac number, because 171903 - 2¹⁶ = 106367 is a prime.

It is a D-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 171903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171923) 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, 28648 + ... + 28653.

It is an arithmetic number, because the mean of its divisors is an integer number (57302).

2¹⁷¹⁹⁰³ is an apocalyptic number.

171903 is a deficient number, since it is larger than the sum of its proper divisors (57305).

171903 is an equidigital number, since it uses as much as digits as its factorization.

171903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57304.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 171903 is about 414.6118666898. The cubic root of 171903 is about 55.6025213218.

The spelling of 171903 in words is "one hundred seventy-one thousand, nine hundred three".