3921121 has 2 divisors, whose sum is σ = 3921122. Its totient is φ = 3921120.

The previous prime is 3921089. The next prime is 3921139. The reversal of 3921121 is 1211293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3045025 + 876096 = 1745^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921121 - 2⁵ = 3921089 is a prime.

It is not a weakly prime, because it can be changed into another prime (3921161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960560 + 1960561.

It is an arithmetic number, because the mean of its divisors is an integer number (1960561).

Almost surely, 2^3921121 is an apocalyptic number.

It is an amenable number.

3921121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921121 is an equidigital number, since it uses as much as digits as its factorization.

3921121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 3921121 is about 1980.1820623367. The cubic root of 3921121 is about 157.6897318757.

The spelling of 3921121 in words is "three million, nine hundred twenty-one thousand, one hundred twenty-one".