3871811 has 2 divisors, whose sum is σ = 3871812. Its totient is φ = 3871810.

The previous prime is 3871787. The next prime is 3871817. The reversal of 3871811 is 1181783.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3871811 is a prime.

It is not a weakly prime, because it can be changed into another prime (3871817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935905 + 1935906.

It is an arithmetic number, because the mean of its divisors is an integer number (1935906).

Almost surely, 2^3871811 is an apocalyptic number.

3871811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3871811 is an equidigital number, since it uses as much as digits as its factorization.

3871811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 3871811 is about 1967.6917949720. The cubic root of 3871811 is about 157.0259332119.

The spelling of 3871811 in words is "three million, eight hundred seventy-one thousand, eight hundred eleven".