381028191 has 16 divisors (see below), whose sum is σ = 538472448. Its totient is φ = 238832000.

The previous prime is 381028133. The next prime is 381028213. The reversal of 381028191 is 191820183.

It is a cyclic number.

It is not a de Polignac number, because 381028191 - 2¹¹ = 381026143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381028121) 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 15 ways as a sum of consecutive naturals, for example, 55456 + ... + 61946.

It is an arithmetic number, because the mean of its divisors is an integer number (33654528).

Almost surely, 2^381028191 is an apocalyptic number.

381028191 is a deficient number, since it is larger than the sum of its proper divisors (157444257).

381028191 is a wasteful number, since it uses less digits than its factorization.

381028191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 381028191 is about 19519.9434169262. The cubic root of 381028191 is about 724.9683321879.

The spelling of 381028191 in words is "three hundred eighty-one million, twenty-eight thousand, one hundred ninety-one".