381548321 has 16 divisors (see below), whose sum is σ = 476124288. Its totient is φ = 297043200.

The previous prime is 381548269. The next prime is 381548333. The reversal of 381548321 is 123845183.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 381548321 - 2⁶ = 381548257 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381548381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165251 + ... + 167543.

It is an arithmetic number, because the mean of its divisors is an integer number (29757768).

Almost surely, 2^381548321 is an apocalyptic number.

It is an amenable number.

381548321 is a deficient number, since it is larger than the sum of its proper divisors (94575967).

381548321 is a wasteful number, since it uses less digits than its factorization.

381548321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472.

The product of its digits is 23040, while the sum is 35.

The square root of 381548321 is about 19533.2619139764. The cubic root of 381548321 is about 725.2980596100.

The spelling of 381548321 in words is "three hundred eighty-one million, five hundred forty-eight thousand, three hundred twenty-one".