678331013 has 2 divisors, whose sum is σ = 678331014. Its totient is φ = 678331012.

The previous prime is 678331001. The next prime is 678331021. The reversal of 678331013 is 310133876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456976129 + 221354884 = 21377^2 + 14878^2 .

It is a cyclic number.

It is not a de Polignac number, because 678331013 - 2⁴ = 678330997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678331613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339165506 + 339165507.

It is an arithmetic number, because the mean of its divisors is an integer number (339165507).

Almost surely, 2^678331013 is an apocalyptic number.

It is an amenable number.

678331013 is a deficient number, since it is larger than the sum of its proper divisors (1).

678331013 is an equidigital number, since it uses as much as digits as its factorization.

678331013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 678331013 is about 26044.7885958017. The cubic root of 678331013 is about 878.6459086067.

Adding to 678331013 its reverse (310133876), we get a palindrome (988464889).

The spelling of 678331013 in words is "six hundred seventy-eight million, three hundred thirty-one thousand, thirteen".