381155129 has 4 divisors (see below), whose sum is σ = 381454884. Its totient is φ = 380855376.

The previous prime is 381155123. The next prime is 381155153. The reversal of 381155129 is 921551183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 336906025 + 44249104 = 18355^2 + 6652^2 .

It is a cyclic number.

It is not a de Polignac number, because 381155129 - 2²⁴ = 364377913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (381155123) 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, 147962 + ... + 150515.

It is an arithmetic number, because the mean of its divisors is an integer number (95363721).

Almost surely, 2^381155129 is an apocalyptic number.

It is an amenable number.

381155129 is a deficient number, since it is larger than the sum of its proper divisors (299755).

381155129 is a wasteful number, since it uses less digits than its factorization.

381155129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299754.

The product of its digits is 10800, while the sum is 35.

The square root of 381155129 is about 19523.1946412466. The cubic root of 381155129 is about 725.0488300048.

The spelling of 381155129 in words is "three hundred eighty-one million, one hundred fifty-five thousand, one hundred twenty-nine".