381231 has 6 divisors (see below), whose sum is σ = 550680. Its totient is φ = 254148.

The previous prime is 381223. The next prime is 381233. The reversal of 381231 is 132183.

It is not a de Polignac number, because 381231 - 2³ = 381223 is a prime.

It is a super-2 number, since 2×381231² = 290674150722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381233) 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 5 ways as a sum of consecutive naturals, for example, 21171 + ... + 21188.

It is an arithmetic number, because the mean of its divisors is an integer number (91780).

2³⁸¹²³¹ is an apocalyptic number.

381231 is a deficient number, since it is larger than the sum of its proper divisors (169449).

381231 is a wasteful number, since it uses less digits than its factorization.

381231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42365 (or 42362 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 381231 is about 617.4390658195. The cubic root of 381231 is about 72.5096935117.

The spelling of 381231 in words is "three hundred eighty-one thousand, two hundred thirty-one".