3831220381 has 6 divisors (see below), whose sum is σ = 3904874330. Its totient is φ = 3758930448.

The previous prime is 3831220361. The next prime is 3831220387. The reversal of 3831220381 is 1830221383.

It can be written as a sum of positive squares in 3 ways, for example, as 1532017881 + 2299202500 = 39141^2 + 47950^2 .

It is not a de Polignac number, because 3831220381 - 2¹⁷ = 3831089309 is a prime.

It is a super-2 number, since 2×3831220381² = 29356499215579570322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3831220387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 679146 + ... + 684763.

Almost surely, 2^3831220381 is an apocalyptic number.

It is an amenable number.

3831220381 is a deficient number, since it is larger than the sum of its proper divisors (73653949).

3831220381 is an equidigital number, since it uses as much as digits as its factorization.

3831220381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364015 (or 1363962 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 3831220381 is about 61896.8527552088. The cubic root of 3831220381 is about 1564.7527066585.

The spelling of 3831220381 in words is "three billion, eight hundred thirty-one million, two hundred twenty thousand, three hundred eighty-one".