1993711871 has 2 divisors, whose sum is σ = 1993711872. Its totient is φ = 1993711870.

The previous prime is 1993711849. The next prime is 1993711891. The reversal of 1993711871 is 1781173991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1993711871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1993711891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996855935 + 996855936.

It is an arithmetic number, because the mean of its divisors is an integer number (996855936).

Almost surely, 2^1993711871 is an apocalyptic number.

1993711871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993711871 is an equidigital number, since it uses as much as digits as its factorization.

1993711871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 47.

The square root of 1993711871 is about 44651.0007838570. Note that the first 3 decimals coincide. The cubic root of 1993711871 is about 1258.5992392910.

The spelling of 1993711871 in words is "one billion, nine hundred ninety-three million, seven hundred eleven thousand, eight hundred seventy-one".