381633221 has 8 divisors (see below), whose sum is σ = 425350080. Its totient is φ = 340279488.

The previous prime is 381633193. The next prime is 381633229. The reversal of 381633221 is 122336183.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381633221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381633229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590441 + ... + 591086.

It is an arithmetic number, because the mean of its divisors is an integer number (53168760).

Almost surely, 2^381633221 is an apocalyptic number.

It is an amenable number.

381633221 is a deficient number, since it is larger than the sum of its proper divisors (43716859).

381633221 is a wasteful number, since it uses less digits than its factorization.

381633221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181563.

The product of its digits is 5184, while the sum is 29.

The square root of 381633221 is about 19535.4350092339. The cubic root of 381633221 is about 725.3518520439.

The spelling of 381633221 in words is "three hundred eighty-one million, six hundred thirty-three thousand, two hundred twenty-one".