3871381 has 2 divisors, whose sum is σ = 3871382. Its totient is φ = 3871380.

The previous prime is 3871363. The next prime is 3871391. The reversal of 3871381 is 1831783.

3871381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 1343281 = 1590^2 + 1159^2 .

It is an emirp because it is prime and its reverse (1831783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3871381 - 2⁹ = 3870869 is a prime.

It is a super-2 number, since 2×3871381² = 29975181694322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3871321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935690 + 1935691.

It is an arithmetic number, because the mean of its divisors is an integer number (1935691).

Almost surely, 2^3871381 is an apocalyptic number.

It is an amenable number.

3871381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3871381 is an equidigital number, since it uses as much as digits as its factorization.

3871381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 3871381 is about 1967.5825268588. The cubic root of 3871381 is about 157.0201199417.

The spelling of 3871381 in words is "three million, eight hundred seventy-one thousand, three hundred eighty-one".