3981911 has 2 divisors, whose sum is σ = 3981912. Its totient is φ = 3981910.

The previous prime is 3981899. The next prime is 3981917. The reversal of 3981911 is 1191893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3981911 - 2⁶ = 3981847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3981917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990955 + 1990956.

It is an arithmetic number, because the mean of its divisors is an integer number (1990956).

Almost surely, 2^3981911 is an apocalyptic number.

3981911 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981911 is an equidigital number, since it uses as much as digits as its factorization.

3981911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The square root of 3981911 is about 1995.4726257205. The cubic root of 3981911 is about 158.5004561017.

The spelling of 3981911 in words is "three million, nine hundred eighty-one thousand, nine hundred eleven".