678537109 has 2 divisors, whose sum is σ = 678537110. Its totient is φ = 678537108.

The previous prime is 678537061. The next prime is 678537113. The reversal of 678537109 is 901735876.

678537109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660644209 + 17892900 = 25703^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 678537109 - 2⁷ = 678536981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678531109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339268554 + 339268555.

It is an arithmetic number, because the mean of its divisors is an integer number (339268555).

Almost surely, 2^678537109 is an apocalyptic number.

It is an amenable number.

678537109 is a deficient number, since it is larger than the sum of its proper divisors (1).

678537109 is an equidigital number, since it uses as much as digits as its factorization.

678537109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 678537109 is about 26048.7448641964. The cubic root of 678537109 is about 878.7348853586.

The spelling of 678537109 in words is "six hundred seventy-eight million, five hundred thirty-seven thousand, one hundred nine".