381843181 has 4 divisors (see below), whose sum is σ = 389967552. Its totient is φ = 373718812.

The previous prime is 381843179. The next prime is 381843229. The reversal of 381843181 is 181348183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381843181 - 2¹ = 381843179 is a prime.

It is a super-2 number, since 2×381843181² = 291608429752397522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381843181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381843101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062115 + ... + 4062208.

It is an arithmetic number, because the mean of its divisors is an integer number (97491888).

Almost surely, 2^381843181 is an apocalyptic number.

It is an amenable number.

381843181 is a deficient number, since it is larger than the sum of its proper divisors (8124371).

381843181 is an equidigital number, since it uses as much as digits as its factorization.

381843181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8124370.

The product of its digits is 18432, while the sum is 37.

The square root of 381843181 is about 19540.8080948563. The cubic root of 381843181 is about 725.4848479381.

The spelling of 381843181 in words is "three hundred eighty-one million, eight hundred forty-three thousand, one hundred eighty-one".