381919181 has 16 divisors (see below), whose sum is σ = 446448000. Its totient is φ = 326579904.

The previous prime is 381919169. The next prime is 381919189. The reversal of 381919181 is 181919183.

It is a de Polignac number, because none of the positive numbers 2^k-381919181 is a prime.

It is a super-2 number, since 2×381919181² = 291724521631421522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381919189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178325 + ... + 180453.

It is an arithmetic number, because the mean of its divisors is an integer number (27903000).

Almost surely, 2^381919181 is an apocalyptic number.

It is an amenable number.

381919181 is a deficient number, since it is larger than the sum of its proper divisors (64528819).

381919181 is an equidigital number, since it uses as much as digits as its factorization.

381919181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673 (or 2659 counting only the distinct ones).

The product of its digits is 15552, while the sum is 41.

The square root of 381919181 is about 19542.7526464416. The cubic root of 381919181 is about 725.5329769376.

The spelling of 381919181 in words is "three hundred eighty-one million, nine hundred nineteen thousand, one hundred eighty-one".