868989893 has 2 divisors, whose sum is σ = 868989894. Its totient is φ = 868989892.

The previous prime is 868989839. The next prime is 868989917. The reversal of 868989893 is 398989868.

Together with previous prime (868989839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508863364 + 360126529 = 22558^2 + 18977^2 .

It is a cyclic number.

It is not a de Polignac number, because 868989893 - 2¹² = 868985797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868989593) 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, 434494946 + 434494947.

It is an arithmetic number, because the mean of its divisors is an integer number (434494947).

Almost surely, 2^868989893 is an apocalyptic number.

It is an amenable number.

868989893 is a deficient number, since it is larger than the sum of its proper divisors (1).

868989893 is an equidigital number, since it uses as much as digits as its factorization.

868989893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53747712, while the sum is 68.

The square root of 868989893 is about 29478.6345172228. The cubic root of 868989893 is about 954.2706685396.

The spelling of 868989893 in words is "eight hundred sixty-eight million, nine hundred eighty-nine thousand, eight hundred ninety-three".