868020641 has 2 divisors, whose sum is σ = 868020642. Its totient is φ = 868020640.

The previous prime is 868020623. The next prime is 868020679. The reversal of 868020641 is 146020868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506070016 + 361950625 = 22496^2 + 19025^2 .

It is a cyclic number.

It is not a de Polignac number, because 868020641 - 2¹⁴ = 868004257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (868020611) 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, 434010320 + 434010321.

It is an arithmetic number, because the mean of its divisors is an integer number (434010321).

Almost surely, 2^868020641 is an apocalyptic number.

It is an amenable number.

868020641 is a deficient number, since it is larger than the sum of its proper divisors (1).

868020641 is an equidigital number, since it uses as much as digits as its factorization.

868020641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 868020641 is about 29462.1900238255. The cubic root of 868020641 is about 953.9157457891.

The spelling of 868020641 in words is "eight hundred sixty-eight million, twenty thousand, six hundred forty-one".