678835121 has 2 divisors, whose sum is σ = 678835122. Its totient is φ = 678835120.

The previous prime is 678835111. The next prime is 678835141. The reversal of 678835121 is 121538876.

678835121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524181025 + 154654096 = 22895^2 + 12436^2 .

It is a cyclic number.

It is not a de Polignac number, because 678835121 - 2¹⁰ = 678834097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678835111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339417560 + 339417561.

It is an arithmetic number, because the mean of its divisors is an integer number (339417561).

Almost surely, 2^678835121 is an apocalyptic number.

It is an amenable number.

678835121 is a deficient number, since it is larger than the sum of its proper divisors (1).

678835121 is an equidigital number, since it uses as much as digits as its factorization.

678835121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 678835121 is about 26054.4645118644. The cubic root of 678835121 is about 878.8635126699.

The spelling of 678835121 in words is "six hundred seventy-eight million, eight hundred thirty-five thousand, one hundred twenty-one".