381481 has 2 divisors, whose sum is σ = 381482. Its totient is φ = 381480.

The previous prime is 381467. The next prime is 381487. The reversal of 381481 is 184183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379456 + 2025 = 616^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 381481 - 2¹¹ = 379433 is a prime.

It is a super-2 number, since 2×381481² = 291055506722, which contains 22 as substring.

It is an Ulam number.

381481 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381481.

It is not a weakly prime, because it can be changed into another prime (381487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190740 + 190741.

It is an arithmetic number, because the mean of its divisors is an integer number (190741).

2³⁸¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

381481 is a deficient number, since it is larger than the sum of its proper divisors (1).

381481 is an equidigital number, since it uses as much as digits as its factorization.

381481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 381481 is about 617.6414817675. The cubic root of 381481 is about 72.5255399515.

The spelling of 381481 in words is "three hundred eighty-one thousand, four hundred eighty-one".