381139189 has 4 divisors (see below), whose sum is σ = 381178240. Its totient is φ = 381100140.

The previous prime is 381139153. The next prime is 381139193. The reversal of 381139189 is 981931183.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 381139189 - 2¹⁵ = 381106421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381134189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9322 + ... + 29140.

It is an arithmetic number, because the mean of its divisors is an integer number (95294560).

Almost surely, 2^381139189 is an apocalyptic number.

It is an amenable number.

381139189 is a deficient number, since it is larger than the sum of its proper divisors (39051).

381139189 is a wasteful number, since it uses less digits than its factorization.

381139189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39050.

The product of its digits is 46656, while the sum is 43.

The square root of 381139189 is about 19522.7864046094. The cubic root of 381139189 is about 725.0387226246.

The spelling of 381139189 in words is "three hundred eighty-one million, one hundred thirty-nine thousand, one hundred eighty-nine".