381566115 has 48 divisors (see below), whose sum is σ = 758766528. Its totient is φ = 173760768.

The previous prime is 381566033. The next prime is 381566117. The reversal of 381566115 is 511665183.

381566115 is a `hidden beast` number, since 3 + 81 + 566 + 1 + 15 = 666.

It is not a de Polignac number, because 381566115 - 2¹⁰ = 381565091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381566115.

It is not an unprimeable number, because it can be changed into a prime (381566117) 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 47 ways as a sum of consecutive naturals, for example, 85069 + ... + 89441.

It is an arithmetic number, because the mean of its divisors is an integer number (15807636).

Almost surely, 2^381566115 is an apocalyptic number.

381566115 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

381566115 is a deficient number, since it is larger than the sum of its proper divisors (377200413).

381566115 is a wasteful number, since it uses less digits than its factorization.

381566115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668 (or 4665 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 381566115 is about 19533.7173881471. The cubic root of 381566115 is about 725.3093345061.

The spelling of 381566115 in words is "three hundred eighty-one million, five hundred sixty-six thousand, one hundred fifteen".