867859649 has 2 divisors, whose sum is σ = 867859650. Its totient is φ = 867859648.

The previous prime is 867859631. The next prime is 867859687. The reversal of 867859649 is 946958768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549058624 + 318801025 = 23432^2 + 17855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-867859649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 867859591 and 867859600.

It is not a weakly prime, because it can be changed into another prime (867859609) 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, 433929824 + 433929825.

It is an arithmetic number, because the mean of its divisors is an integer number (433929825).

Almost surely, 2^867859649 is an apocalyptic number.

It is an amenable number.

867859649 is a deficient number, since it is larger than the sum of its proper divisors (1).

867859649 is an equidigital number, since it uses as much as digits as its factorization.

867859649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The square root of 867859649 is about 29459.4577173444. The cubic root of 867859649 is about 953.8567678141.

The spelling of 867859649 in words is "eight hundred sixty-seven million, eight hundred fifty-nine thousand, six hundred forty-nine".