381693221 has 16 divisors (see below), whose sum is σ = 482477184. Its totient is φ = 293834304.

The previous prime is 381693199. The next prime is 381693233. The reversal of 381693221 is 122396183.

It is a cyclic number.

It is not a de Polignac number, because 381693221 - 2²² = 377498917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381693271) 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, 53315 + ... + 60048.

It is an arithmetic number, because the mean of its divisors is an integer number (30154824).

Almost surely, 2^381693221 is an apocalyptic number.

It is an amenable number.

381693221 is a deficient number, since it is larger than the sum of its proper divisors (100783963).

381693221 is a wasteful number, since it uses less digits than its factorization.

381693221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113420.

The product of its digits is 15552, while the sum is 35.

The square root of 381693221 is about 19536.9706198274. The cubic root of 381693221 is about 725.3898630871.

The spelling of 381693221 in words is "three hundred eighty-one million, six hundred ninety-three thousand, two hundred twenty-one".