381338317 has 4 divisors (see below), whose sum is σ = 391644796. Its totient is φ = 371031840.

The previous prime is 381338291. The next prime is 381338329. The reversal of 381338317 is 713833183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713833183 = 7 ⋅101976169.

It can be written as a sum of positive squares in 2 ways, for example, as 302377321 + 78960996 = 17389^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 381338317 - 2¹¹ = 381336269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 10306441 = 381338317 / (3 + 8 + 1 + 3 + 3 + 8 + 3 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381338117) 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, 5153184 + ... + 5153257.

It is an arithmetic number, because the mean of its divisors is an integer number (97911199).

Almost surely, 2^381338317 is an apocalyptic number.

381338317 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

381338317 is a deficient number, since it is larger than the sum of its proper divisors (10306479).

381338317 is a wasteful number, since it uses less digits than its factorization.

381338317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306478.

The product of its digits is 36288, while the sum is 37.

The square root of 381338317 is about 19527.8856254332. The cubic root of 381338317 is about 725.1649672958.

The spelling of 381338317 in words is "three hundred eighty-one million, three hundred thirty-eight thousand, three hundred seventeen".