868585849 has 2 divisors, whose sum is σ = 868585850. Its totient is φ = 868585848.

The previous prime is 868585843. The next prime is 868585903. The reversal of 868585849 is 948585868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465178624 + 403407225 = 21568^2 + 20085^2 .

It is a cyclic number.

It is not a de Polignac number, because 868585849 - 2²¹ = 866488697 is a prime.

It is not a weakly prime, because it can be changed into another prime (868585843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434292924 + 434292925.

It is an arithmetic number, because the mean of its divisors is an integer number (434292925).

Almost surely, 2^868585849 is an apocalyptic number.

It is an amenable number.

868585849 is a deficient number, since it is larger than the sum of its proper divisors (1).

868585849 is an equidigital number, since it uses as much as digits as its factorization.

868585849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22118400, while the sum is 61.

The square root of 868585849 is about 29471.7805536075. The cubic root of 868585849 is about 954.1227469454.

The spelling of 868585849 in words is "eight hundred sixty-eight million, five hundred eighty-five thousand, eight hundred forty-nine".