868877981 has 2 divisors, whose sum is σ = 868877982. Its totient is φ = 868877980.

The previous prime is 868877963. The next prime is 868878029. The reversal of 868877981 is 189778868.

868877981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640596100 + 228281881 = 25310^2 + 15109^2 .

It is a cyclic number.

It is not a de Polignac number, because 868877981 - 2⁶ = 868877917 is a prime.

It is a super-2 number, since 2×868877981² = 1509897891733272722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868877921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434438990 + 434438991.

It is an arithmetic number, because the mean of its divisors is an integer number (434438991).

Almost surely, 2^868877981 is an apocalyptic number.

It is an amenable number.

868877981 is a deficient number, since it is larger than the sum of its proper divisors (1).

868877981 is an equidigital number, since it uses as much as digits as its factorization.

868877981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 62.

The square root of 868877981 is about 29476.7362677756. The cubic root of 868877981 is about 954.2297018477.

The spelling of 868877981 in words is "eight hundred sixty-eight million, eight hundred seventy-seven thousand, nine hundred eighty-one".