381218199 has 4 divisors (see below), whose sum is σ = 508290936. Its totient is φ = 254145464.

The previous prime is 381218197. The next prime is 381218221. The reversal of 381218199 is 991812183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991812183 = 3 ⋅330604061.

It is a cyclic number.

It is not a de Polignac number, because 381218199 - 2¹ = 381218197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381218199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381218197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63536364 + ... + 63536369.

It is an arithmetic number, because the mean of its divisors is an integer number (127072734).

Almost surely, 2^381218199 is an apocalyptic number.

381218199 is a deficient number, since it is larger than the sum of its proper divisors (127072737).

381218199 is a wasteful number, since it uses less digits than its factorization.

381218199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127072736.

The product of its digits is 31104, while the sum is 42.

The square root of 381218199 is about 19524.8098326206. The cubic root of 381218199 is about 725.0888192412.

The spelling of 381218199 in words is "three hundred eighty-one million, two hundred eighteen thousand, one hundred ninety-nine".