381871321 has 8 divisors (see below), whose sum is σ = 415868040. Its totient is φ = 348534912.

The previous prime is 381871319. The next prime is 381871327. The reversal of 381871321 is 123178183.

It can be written as a sum of positive squares in 4 ways, for example, as 26925721 + 354945600 = 5189^2 + 18840^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 381871321 - 2¹ = 381871319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381871327) 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, 163870 + ... + 166183.

It is an arithmetic number, because the mean of its divisors is an integer number (51983505).

Almost surely, 2^381871321 is an apocalyptic number.

It is an amenable number.

381871321 is a deficient number, since it is larger than the sum of its proper divisors (33996719).

381871321 is a wasteful number, since it uses less digits than its factorization.

381871321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330155.

The product of its digits is 8064, while the sum is 34.

The square root of 381871321 is about 19541.5281132259. The cubic root of 381871321 is about 725.5026690779.

The spelling of 381871321 in words is "three hundred eighty-one million, eight hundred seventy-one thousand, three hundred twenty-one".