381347129 has 4 divisors (see below), whose sum is σ = 394497060. Its totient is φ = 368197200.

The previous prime is 381347117. The next prime is 381347159. The reversal of 381347129 is 921743183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921743183 = 5923 ⋅155621.

It can be written as a sum of positive squares in 2 ways, for example, as 325441600 + 55905529 = 18040^2 + 7477^2 .

It is a cyclic number.

It is not a de Polignac number, because 381347129 - 2²⁰ = 380298553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381347092 and 381347101.

It is not an unprimeable number, because it can be changed into a prime (381347159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6574922 + ... + 6574979.

It is an arithmetic number, because the mean of its divisors is an integer number (98624265).

Almost surely, 2^381347129 is an apocalyptic number.

It is an amenable number.

381347129 is a deficient number, since it is larger than the sum of its proper divisors (13149931).

381347129 is a wasteful number, since it uses less digits than its factorization.

381347129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13149930.

The product of its digits is 36288, while the sum is 38.

The square root of 381347129 is about 19528.1112501952. Note that the first 3 decimals coincide. The cubic root of 381347129 is about 725.1705529785.

The spelling of 381347129 in words is "three hundred eighty-one million, three hundred forty-seven thousand, one hundred twenty-nine".