381698191 has 6 divisors (see below), whose sum is σ = 444016320. Its totient is φ = 327169836.

The previous prime is 381698189. The next prime is 381698197. The reversal of 381698191 is 191896183.

It is a happy number.

It is not a de Polignac number, because 381698191 - 2¹ = 381698189 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 (381698197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3894831 + ... + 3894928.

It is an arithmetic number, because the mean of its divisors is an integer number (74002720).

Almost surely, 2^381698191 is an apocalyptic number.

381698191 is a deficient number, since it is larger than the sum of its proper divisors (62318129).

381698191 is an equidigital number, since it uses as much as digits as its factorization.

381698191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7789773 (or 7789766 counting only the distinct ones).

The product of its digits is 93312, while the sum is 46.

The square root of 381698191 is about 19537.0978141586. The cubic root of 381698191 is about 725.3930114899.

It can be divided in two parts, 38169 and 8191, that added together give a triangular number (46360 = T₃₀₄).

The spelling of 381698191 in words is "three hundred eighty-one million, six hundred ninety-eight thousand, one hundred ninety-one".