678134441 has 2 divisors, whose sum is σ = 678134442. Its totient is φ = 678134440.

The previous prime is 678134423. The next prime is 678134447. The reversal of 678134441 is 144431876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 484924441 + 193210000 = 22021^2 + 13900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678134441 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678134395 and 678134404.

It is not a weakly prime, because it can be changed into another prime (678134447) 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, 339067220 + 339067221.

It is an arithmetic number, because the mean of its divisors is an integer number (339067221).

Almost surely, 2^678134441 is an apocalyptic number.

It is an amenable number.

678134441 is a deficient number, since it is larger than the sum of its proper divisors (1).

678134441 is an equidigital number, since it uses as much as digits as its factorization.

678134441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 678134441 is about 26041.0145923695. The cubic root of 678134441 is about 878.5610268078.

The spelling of 678134441 in words is "six hundred seventy-eight million, one hundred thirty-four thousand, four hundred forty-one".