678941 has 2 divisors, whose sum is σ = 678942. Its totient is φ = 678940.

The previous prime is 678907. The next prime is 678943. The reversal of 678941 is 149876.

678941 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., 674041 + 4900 = 821^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 678941 - 2¹⁸ = 416797 is a prime.

It is a Sophie Germain prime.

Together with 678943, it forms a pair of twin primes.

It is a Chen prime.

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

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339470 + 339471.

It is an arithmetic number, because the mean of its divisors is an integer number (339471).

2⁶⁷⁸⁹⁴¹ is an apocalyptic number.

It is an amenable number.

678941 is a deficient number, since it is larger than the sum of its proper divisors (1).

678941 is an equidigital number, since it uses as much as digits as its factorization.

678941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 678941 is about 823.9787618622. The cubic root of 678941 is about 87.8909202877.

Adding to 678941 its sum of digits (35), we get a square (678976 = 824²).

The spelling of 678941 in words is "six hundred seventy-eight thousand, nine hundred forty-one".