3971213 has 2 divisors, whose sum is σ = 3971214. Its totient is φ = 3971212.

The previous prime is 3971207. The next prime is 3971239. The reversal of 3971213 is 3121793.

3971213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (3971239) can be obtained adding 3971213 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3396649 + 574564 = 1843^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971213 - 2¹⁰ = 3970189 is a prime.

It is a super-3 number, since 3×3971213³ (a number of 21 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3971263) 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, 1985606 + 1985607.

It is an arithmetic number, because the mean of its divisors is an integer number (1985607).

Almost surely, 2^3971213 is an apocalyptic number.

It is an amenable number.

3971213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971213 is an equidigital number, since it uses as much as digits as its factorization.

3971213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 26.

The square root of 3971213 is about 1992.7902548939. The cubic root of 3971213 is about 158.3583837250.

The spelling of 3971213 in words is "three million, nine hundred seventy-one thousand, two hundred thirteen".