381191617 has 4 divisors (see below), whose sum is σ = 383750100. Its totient is φ = 378633136.

The previous prime is 381191599. The next prime is 381191641. The reversal of 381191617 is 716191183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716191183 = 929 ⋅770927.

It can be written as a sum of positive squares in 2 ways, for example, as 43771456 + 337420161 = 6616^2 + 18369^2 .

It is a cyclic number.

It is not a de Polignac number, because 381191617 - 2¹⁵ = 381158849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381191647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279018 + ... + 1279315.

It is an arithmetic number, because the mean of its divisors is an integer number (95937525).

Almost surely, 2^381191617 is an apocalyptic number.

It is an amenable number.

381191617 is a deficient number, since it is larger than the sum of its proper divisors (2558483).

381191617 is a wasteful number, since it uses less digits than its factorization.

381191617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558482.

The product of its digits is 9072, while the sum is 37.

The square root of 381191617 is about 19524.1290970942. The cubic root of 381191617 is about 725.0719655871.

The spelling of 381191617 in words is "three hundred eighty-one million, one hundred ninety-one thousand, six hundred seventeen".