6868649 has 2 divisors, whose sum is σ = 6868650. Its totient is φ = 6868648.

The previous prime is 6868613. The next prime is 6868681. The reversal of 6868649 is 9468686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4818025 + 2050624 = 2195^2 + 1432^2 .

It is a cyclic number.

It is not a de Polignac number, because 6868649 - 2¹² = 6864553 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 (6868699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3434324 + 3434325.

It is an arithmetic number, because the mean of its divisors is an integer number (3434325).

Almost surely, 2^6868649 is an apocalyptic number.

It is an amenable number.

6868649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6868649 is an equidigital number, since it uses as much as digits as its factorization.

6868649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 6868649 is about 2620.8107524199. The cubic root of 6868649 is about 190.0890533602.

The spelling of 6868649 in words is "six million, eight hundred sixty-eight thousand, six hundred forty-nine".