3998805571 has 2 divisors, whose sum is σ = 3998805572. Its totient is φ = 3998805570.

The previous prime is 3998805541. The next prime is 3998805583. The reversal of 3998805571 is 1755088993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3998805571 - 2⁵ = 3998805539 is a prime.

It is not a weakly prime, because it can be changed into another prime (3998805521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999402785 + 1999402786.

It is an arithmetic number, because the mean of its divisors is an integer number (1999402786).

Almost surely, 2^3998805571 is an apocalyptic number.

3998805571 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998805571 is an equidigital number, since it uses as much as digits as its factorization.

3998805571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 55.

The square root of 3998805571 is about 63236.1097079825. The cubic root of 3998805571 is about 1587.2430330844.

The spelling of 3998805571 in words is "three billion, nine hundred ninety-eight million, eight hundred five thousand, five hundred seventy-one".