1968131771 has 2 divisors, whose sum is σ = 1968131772. Its totient is φ = 1968131770.

The previous prime is 1968131743. The next prime is 1968131797. The reversal of 1968131771 is 1771318691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968131771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1968131741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984065885 + 984065886.

It is an arithmetic number, because the mean of its divisors is an integer number (984065886).

Almost surely, 2^1968131771 is an apocalyptic number.

1968131771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968131771 is an equidigital number, since it uses as much as digits as its factorization.

1968131771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 1968131771 is about 44363.6311746457. The cubic root of 1968131771 is about 1253.1932799042.

The spelling of 1968131771 in words is "one billion, nine hundred sixty-eight million, one hundred thirty-one thousand, seven hundred seventy-one".