868841641 has 2 divisors, whose sum is σ = 868841642. Its totient is φ = 868841640.

The previous prime is 868841609. The next prime is 868841651. The reversal of 868841641 is 146148868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 475414416 + 393427225 = 21804^2 + 19835^2 .

It is a cyclic number.

It is not a de Polignac number, because 868841641 - 2⁵ = 868841609 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 868841591 and 868841600.

It is not a weakly prime, because it can be changed into another prime (868841651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434420820 + 434420821.

It is an arithmetic number, because the mean of its divisors is an integer number (434420821).

Almost surely, 2^868841641 is an apocalyptic number.

It is an amenable number.

868841641 is a deficient number, since it is larger than the sum of its proper divisors (1).

868841641 is an equidigital number, since it uses as much as digits as its factorization.

868841641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294912, while the sum is 46.

The square root of 868841641 is about 29476.1198430187. The cubic root of 868841641 is about 954.2163984105.

The spelling of 868841641 in words is "eight hundred sixty-eight million, eight hundred forty-one thousand, six hundred forty-one".