3981563 has 2 divisors, whose sum is σ = 3981564. Its totient is φ = 3981562.

The previous prime is 3981541. The next prime is 3981569. The reversal of 3981563 is 3651893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3981563 - 2¹⁶ = 3916027 is a prime.

It is not a weakly prime, because it can be changed into another prime (3981569) 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, 1990781 + 1990782.

It is an arithmetic number, because the mean of its divisors is an integer number (1990782).

Almost surely, 2^3981563 is an apocalyptic number.

3981563 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981563 is an equidigital number, since it uses as much as digits as its factorization.

3981563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 3981563 is about 1995.3854264277. The cubic root of 3981563 is about 158.4958385729.

The spelling of 3981563 in words is "three million, nine hundred eighty-one thousand, five hundred sixty-three".