381181 has 2 divisors, whose sum is σ = 381182. Its totient is φ = 381180.

The previous prime is 381169. The next prime is 381209. The reversal of 381181 is 181183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217156 + 164025 = 466^2 + 405^2 .

It is an emirp because it is prime and its reverse (181183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381181 - 2¹¹ = 379133 is a prime.

It is a super-2 number, since 2×381181² = 290597909522, which contains 22 as substring.

381181 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190590 + 190591.

It is an arithmetic number, because the mean of its divisors is an integer number (190591).

2³⁸¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

381181 is a deficient number, since it is larger than the sum of its proper divisors (1).

381181 is an equidigital number, since it uses as much as digits as its factorization.

381181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

The square root of 381181 is about 617.3985746663. The cubic root of 381181 is about 72.5065233924.

The spelling of 381181 in words is "three hundred eighty-one thousand, one hundred eighty-one".