3991727771 has 2 divisors, whose sum is σ = 3991727772. Its totient is φ = 3991727770.

The previous prime is 3991727749. The next prime is 3991727791. The reversal of 3991727771 is 1777271993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991727771 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991727791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995863885 + 1995863886.

It is an arithmetic number, because the mean of its divisors is an integer number (1995863886).

Almost surely, 2^3991727771 is an apocalyptic number.

3991727771 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991727771 is an equidigital number, since it uses as much as digits as its factorization.

3991727771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166886, while the sum is 53.

The square root of 3991727771 is about 63180.1216443907. The cubic root of 3991727771 is about 1586.3060180052.

The spelling of 3991727771 in words is "three billion, nine hundred ninety-one million, seven hundred twenty-seven thousand, seven hundred seventy-one".