678612941 has 2 divisors, whose sum is σ = 678612942. Its totient is φ = 678612940.

The previous prime is 678612937. The next prime is 678612947. The reversal of 678612941 is 149216876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626050441 + 52562500 = 25021^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 678612941 - 2² = 678612937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678612892 and 678612901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678612947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339306470 + 339306471.

It is an arithmetic number, because the mean of its divisors is an integer number (339306471).

Almost surely, 2^678612941 is an apocalyptic number.

It is an amenable number.

678612941 is a deficient number, since it is larger than the sum of its proper divisors (1).

678612941 is an equidigital number, since it uses as much as digits as its factorization.

678612941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 678612941 is about 26050.2004023002. The cubic root of 678612941 is about 878.7676193785.

The spelling of 678612941 in words is "six hundred seventy-eight million, six hundred twelve thousand, nine hundred forty-one".