171381 has 8 divisors (see below), whose sum is σ = 261184. Its totient is φ = 97920.

The previous prime is 171341. The next prime is 171383. The reversal of 171381 is 183171.

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

It is not a de Polignac number, because 171381 - 2⁶ = 171317 is a prime.

It is a super-2 number, since 2×171381² = 58742894322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 8161 = 171381 / (1 + 7 + 1 + 3 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171383) 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 7 ways as a sum of consecutive naturals, for example, 4060 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (32648).

2¹⁷¹³⁸¹ is an apocalyptic number.

It is an amenable number.

171381 is a deficient number, since it is larger than the sum of its proper divisors (89803).

171381 is an equidigital number, since it uses as much as digits as its factorization.

171381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8171.

The product of its digits is 168, while the sum is 21.

The square root of 171381 is about 413.9818836616. The cubic root of 171381 is about 55.5461834561.

The spelling of 171381 in words is "one hundred seventy-one thousand, three hundred eighty-one".