381919191 has 8 divisors (see below), whose sum is σ = 509368704. Its totient is φ = 254541240.

The previous prime is 381919189. The next prime is 381919193. The reversal of 381919191 is 191919183.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (381919189) and next prime (381919193).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381919191 - 2¹ = 381919189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381919193) 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 7 ways as a sum of consecutive naturals, for example, 3865 + ... + 27906.

It is an arithmetic number, because the mean of its divisors is an integer number (63671088).

Almost surely, 2^381919191 is an apocalyptic number.

381919191 is a deficient number, since it is larger than the sum of its proper divisors (127449513).

381919191 is a wasteful number, since it uses less digits than its factorization.

381919191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35781.

The product of its digits is 17496, while the sum is 42.

The square root of 381919191 is about 19542.7529022909. The cubic root of 381919191 is about 725.5329832700.

The spelling of 381919191 in words is "three hundred eighty-one million, nine hundred nineteen thousand, one hundred ninety-one".