381651565 has 8 divisors (see below), whose sum is σ = 462428928. Its totient is φ = 302356560.

The previous prime is 381651539. The next prime is 381651643. The reversal of 381651565 is 565156183.

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

It is not a de Polignac number, because 381651565 - 2¹¹ = 381649517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370021 + ... + 371050.

It is an arithmetic number, because the mean of its divisors is an integer number (57803616).

Almost surely, 2^381651565 is an apocalyptic number.

It is an amenable number.

381651565 is a deficient number, since it is larger than the sum of its proper divisors (80777363).

381651565 is a wasteful number, since it uses less digits than its factorization.

381651565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741179.

The product of its digits is 108000, while the sum is 40.

The square root of 381651565 is about 19535.9045093899. The cubic root of 381651565 is about 725.3634737097.

The spelling of 381651565 in words is "three hundred eighty-one million, six hundred fifty-one thousand, five hundred sixty-five".