3971281 has 2 divisors, whose sum is σ = 3971282. Its totient is φ = 3971280.

The previous prime is 3971267. The next prime is 3971287. The reversal of 3971281 is 1821793.

3971281 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., 2531281 + 1440000 = 1591^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971281 - 2⁷ = 3971153 is a prime.

It is a super-2 number, since 2×3971281² = 31542145561922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3971287) 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, 1985640 + 1985641.

It is an arithmetic number, because the mean of its divisors is an integer number (1985641).

Almost surely, 2^3971281 is an apocalyptic number.

It is an amenable number.

3971281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971281 is an equidigital number, since it uses as much as digits as its factorization.

3971281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 3971281 is about 1992.8073163254. The cubic root of 3971281 is about 158.3592875889.

It can be divided in two parts, 39712 and 81, that added together give a palindrome (39793).

The spelling of 3971281 in words is "three million, nine hundred seventy-one thousand, two hundred eighty-one".