3967121 has 2 divisors, whose sum is σ = 3967122. Its totient is φ = 3967120.

The previous prime is 3967111. The next prime is 3967123. The reversal of 3967121 is 1217693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 26896 = 1985^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 3967121 - 2⁶ = 3967057 is a prime.

Together with 3967123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3967123) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983560 + 1983561.

It is an arithmetic number, because the mean of its divisors is an integer number (1983561).

Almost surely, 2^3967121 is an apocalyptic number.

It is an amenable number.

3967121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3967121 is an equidigital number, since it uses as much as digits as its factorization.

3967121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 3967121 is about 1991.7632891486. The cubic root of 3967121 is about 158.3039733803.

The spelling of 3967121 in words is "three million, nine hundred sixty-seven thousand, one hundred twenty-one".