381365605 has 4 divisors (see below), whose sum is σ = 457638732. Its totient is φ = 305092480.

The previous prime is 381365591. The next prime is 381365639. The reversal of 381365605 is 506563183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506563183 = 7 ⋅72366169.

It can be written as a sum of positive squares in 2 ways, for example, as 272184004 + 109181601 = 16498^2 + 10449^2 .

It is not a de Polignac number, because 381365605 - 2¹⁷ = 381234533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 38136556 + ... + 38136565.

It is an arithmetic number, because the mean of its divisors is an integer number (114409683).

Almost surely, 2^381365605 is an apocalyptic number.

It is an amenable number.

381365605 is a deficient number, since it is larger than the sum of its proper divisors (76273127).

381365605 is an equidigital number, since it uses as much as digits as its factorization.

381365605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76273126.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 381365605 is about 19528.5843060883. The cubic root of 381365605 is about 725.1822641237.

The spelling of 381365605 in words is "three hundred eighty-one million, three hundred sixty-five thousand, six hundred five".