381331 has 4 divisors (see below), whose sum is σ = 393664. Its totient is φ = 369000.

The previous prime is 381323. The next prime is 381343. The reversal of 381331 is 133183.

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 381331 - 2³ = 381323 is a prime.

It is a super-2 number, since 2×381331² = 290826663122, which contains 22 as substring.

It is a Duffinian number.

381331 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 381299 and 381308.

It is not an unprimeable number, because it can be changed into a prime (381301) 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, 6120 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (98416).

2³⁸¹³³¹ is an apocalyptic number.

381331 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

381331 is a deficient number, since it is larger than the sum of its proper divisors (12333).

381331 is a wasteful number, since it uses less digits than its factorization.

381331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12332.

The product of its digits is 216, while the sum is 19.

The square root of 381331 is about 617.5200401606. The cubic root of 381331 is about 72.5160329187.

It can be divided in two parts, 3813 and 31, that added together give a square (3844 = 62²).

The spelling of 381331 in words is "three hundred eighty-one thousand, three hundred thirty-one".