1968133187 has 2 divisors, whose sum is σ = 1968133188. Its totient is φ = 1968133186.

The previous prime is 1968133171. The next prime is 1968133309. The reversal of 1968133187 is 7813318691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1968133187 - 2⁴ = 1968133171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1968133117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984066593 + 984066594.

It is an arithmetic number, because the mean of its divisors is an integer number (984066594).

Almost surely, 2^1968133187 is an apocalyptic number.

1968133187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968133187 is an equidigital number, since it uses as much as digits as its factorization.

1968133187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 1968133187 is about 44363.6471336611. The cubic root of 1968133187 is about 1253.1935804466.

The spelling of 1968133187 in words is "one billion, nine hundred sixty-eight million, one hundred thirty-three thousand, one hundred eighty-seven".