381081 has 8 divisors (see below), whose sum is σ = 516960. Its totient is φ = 249632.

The previous prime is 381077. The next prime is 381097. The reversal of 381081 is 180183.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 381081 - 2² = 381077 is a prime.

It is a super-2 number, since 2×381081² = 290445457122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (64620).

2³⁸¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

381081 is a deficient number, since it is larger than the sum of its proper divisors (135879).

381081 is a wasteful number, since it uses less digits than its factorization.

381081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 381081 is about 617.3175843923. The cubic root of 381081 is about 72.5001823222.

The spelling of 381081 in words is "three hundred eighty-one thousand, eighty-one".