861968893 has 2 divisors, whose sum is σ = 861968894. Its totient is φ = 861968892.

The previous prime is 861968881. The next prime is 861968911. The reversal of 861968893 is 398869168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861892164 + 76729 = 29358^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 861968893 - 2⁹ = 861968381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861968803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430984446 + 430984447.

It is an arithmetic number, because the mean of its divisors is an integer number (430984447).

Almost surely, 2^861968893 is an apocalyptic number.

It is an amenable number.

861968893 is a deficient number, since it is larger than the sum of its proper divisors (1).

861968893 is an equidigital number, since it uses as much as digits as its factorization.

861968893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 58.

The square root of 861968893 is about 29359.3067527147. The cubic root of 861968893 is about 951.6937072963.

The spelling of 861968893 in words is "eight hundred sixty-one million, nine hundred sixty-eight thousand, eight hundred ninety-three".