678872197 has 2 divisors, whose sum is σ = 678872198. Its totient is φ = 678872196.

The previous prime is 678872191. The next prime is 678872213. The reversal of 678872197 is 791278876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492440481 + 186431716 = 22191^2 + 13654^2 .

It is a cyclic number.

It is not a de Polignac number, because 678872197 - 2²³ = 670483589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678872191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339436098 + 339436099.

It is an arithmetic number, because the mean of its divisors is an integer number (339436099).

Almost surely, 2^678872197 is an apocalyptic number.

It is an amenable number.

678872197 is a deficient number, since it is larger than the sum of its proper divisors (1).

678872197 is an equidigital number, since it uses as much as digits as its factorization.

678872197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 55.

The square root of 678872197 is about 26055.1760116872. The cubic root of 678872197 is about 878.8795127016.

The spelling of 678872197 in words is "six hundred seventy-eight million, eight hundred seventy-two thousand, one hundred ninety-seven".