381102145 has 4 divisors (see below), whose sum is σ = 457322580. Its totient is φ = 304881712.

The previous prime is 381102131. The next prime is 381102149. The reversal of 381102145 is 541201183.

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 112699456 + 268402689 = 10616^2 + 16383^2 .

It is a cyclic number.

It is not a de Polignac number, because 381102145 - 2²¹ = 379004993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381102149) 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, 38110210 + ... + 38110219.

It is an arithmetic number, because the mean of its divisors is an integer number (114330645).

Almost surely, 2^381102145 is an apocalyptic number.

It is an amenable number.

381102145 is a deficient number, since it is larger than the sum of its proper divisors (76220435).

381102145 is an equidigital number, since it uses as much as digits as its factorization.

381102145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76220434.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 381102145 is about 19521.8376440334. The cubic root of 381102145 is about 725.0152323395.

The spelling of 381102145 in words is "three hundred eighty-one million, one hundred two thousand, one hundred forty-five".