381571 has 4 divisors (see below), whose sum is σ = 386872. Its totient is φ = 376272.

The previous prime is 381569. The next prime is 381607. The reversal of 381571 is 175183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175183 = 167 ⋅1049.

It is a cyclic number.

It is not a de Polignac number, because 381571 - 2¹ = 381569 is a prime.

It is a Duffinian number.

381571 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (381541) 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, 2541 + ... + 2686.

It is an arithmetic number, because the mean of its divisors is an integer number (96718).

2³⁸¹⁵⁷¹ is an apocalyptic number.

381571 is a deficient number, since it is larger than the sum of its proper divisors (5301).

381571 is an equidigital number, since it uses as much as digits as its factorization.

381571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300.

The product of its digits is 840, while the sum is 25.

The square root of 381571 is about 617.7143352716. The cubic root of 381571 is about 72.5312429750.

The spelling of 381571 in words is "three hundred eighty-one thousand, five hundred seventy-one".