678197969 has 2 divisors, whose sum is σ = 678197970. Its totient is φ = 678197968.

The previous prime is 678197957. The next prime is 678197977. The reversal of 678197969 is 969791876.

It is a happy number.

678197969 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., 629407744 + 48790225 = 25088^2 + 6985^2 .

It is a cyclic number.

It is not a de Polignac number, because 678197969 - 2⁴ = 678197953 is a prime.

It is a super-2 number, since 2×678197969² = 919904970311449922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678197909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339098984 + 339098985.

It is an arithmetic number, because the mean of its divisors is an integer number (339098985).

Almost surely, 2^678197969 is an apocalyptic number.

It is an amenable number.

678197969 is a deficient number, since it is larger than the sum of its proper divisors (1).

678197969 is an equidigital number, since it uses as much as digits as its factorization.

678197969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 62.

The square root of 678197969 is about 26042.2343319463. The cubic root of 678197969 is about 878.5884606413.

The spelling of 678197969 in words is "six hundred seventy-eight million, one hundred ninety-seven thousand, nine hundred sixty-nine".