968869991 has 2 divisors, whose sum is σ = 968869992. Its totient is φ = 968869990.

The previous prime is 968869987. The next prime is 968869997. The reversal of 968869991 is 199968869.

It is a weak prime.

It is an emirp because it is prime and its reverse (199968869) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 968869991 - 2² = 968869987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (968869997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484434995 + 484434996.

It is an arithmetic number, because the mean of its divisors is an integer number (484434996).

Almost surely, 2^968869991 is an apocalyptic number.

968869991 is a deficient number, since it is larger than the sum of its proper divisors (1).

968869991 is an equidigital number, since it uses as much as digits as its factorization.

968869991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15116544, while the sum is 65.

The square root of 968869991 is about 31126.6765170970. The cubic root of 968869991 is about 989.5137533247.

The spelling of 968869991 in words is "nine hundred sixty-eight million, eight hundred sixty-nine thousand, nine hundred ninety-one".