381781361 has 8 divisors (see below), whose sum is σ = 411879720. Its totient is φ = 351787392.

The previous prime is 381781349. The next prime is 381781363. The reversal of 381781361 is 163187183.

It can be written as a sum of positive squares in 4 ways, for example, as 1336336 + 380445025 = 1156^2 + 19505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381781361 - 2⁶ = 381781297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381781363) 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 7 ways as a sum of consecutive naturals, for example, 18410 + ... + 33203.

It is an arithmetic number, because the mean of its divisors is an integer number (51484965).

Almost surely, 2^381781361 is an apocalyptic number.

It is an amenable number.

381781361 is a deficient number, since it is larger than the sum of its proper divisors (30098359).

381781361 is a wasteful number, since it uses less digits than its factorization.

381781361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52195.

The product of its digits is 24192, while the sum is 38.

The square root of 381781361 is about 19539.2262129287. The cubic root of 381781361 is about 725.4456940864.

The spelling of 381781361 in words is "three hundred eighty-one million, seven hundred eighty-one thousand, three hundred sixty-one".