381368521 has 4 divisors (see below), whose sum is σ = 385071232. Its totient is φ = 377665812.

The previous prime is 381368501. The next prime is 381368573. The reversal of 381368521 is 125863183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381368521 - 2²³ = 372979913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381368501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851201 + ... + 1851406.

It is an arithmetic number, because the mean of its divisors is an integer number (96267808).

Almost surely, 2^381368521 is an apocalyptic number.

It is an amenable number.

381368521 is a deficient number, since it is larger than the sum of its proper divisors (3702711).

381368521 is a wasteful number, since it uses less digits than its factorization.

381368521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702710.

The product of its digits is 34560, while the sum is 37.

The square root of 381368521 is about 19528.6589657355. The cubic root of 381368521 is about 725.1841124166.

The spelling of 381368521 in words is "three hundred eighty-one million, three hundred sixty-eight thousand, five hundred twenty-one".