678169 has 2 divisors, whose sum is σ = 678170. Its totient is φ = 678168.

The previous prime is 678157. The next prime is 678179. The reversal of 678169 is 961876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 262144 = 645^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 678169 - 2⁹ = 677657 is a prime.

It is a super-2 number, since 2×678169² = 919826385122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (678179) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339084 + 339085.

It is an arithmetic number, because the mean of its divisors is an integer number (339085).

2⁶⁷⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

678169 is a deficient number, since it is larger than the sum of its proper divisors (1).

678169 is an equidigital number, since it uses as much as digits as its factorization.

678169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 678169 is about 823.5101699433. The cubic root of 678169 is about 87.8575950926.

The spelling of 678169 in words is "six hundred seventy-eight thousand, one hundred sixty-nine".