3966121 has 2 divisors, whose sum is σ = 3966122. Its totient is φ = 3966120.

The previous prime is 3966119. The next prime is 3966139. The reversal of 3966121 is 1216693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3956121 + 10000 = 1989^2 + 100^2 .

It is an emirp because it is prime and its reverse (1216693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3966121 - 2¹ = 3966119 is a prime.

Together with 3966119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3966121.

It is not a weakly prime, because it can be changed into another prime (3966161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983060 + 1983061.

It is an arithmetic number, because the mean of its divisors is an integer number (1983061).

Almost surely, 2^3966121 is an apocalyptic number.

It is an amenable number.

3966121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3966121 is an equidigital number, since it uses as much as digits as its factorization.

3966121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 3966121 is about 1991.5122394803. The cubic root of 3966121 is about 158.2906709311.

The spelling of 3966121 in words is "three million, nine hundred sixty-six thousand, one hundred twenty-one".