681003613 has 2 divisors, whose sum is σ = 681003614. Its totient is φ = 681003612.

The previous prime is 681003593. The next prime is 681003623. The reversal of 681003613 is 316300186.

681003613 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., 619113924 + 61889689 = 24882^2 + 7867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681003613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681003623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340501806 + 340501807.

It is an arithmetic number, because the mean of its divisors is an integer number (340501807).

Almost surely, 2^681003613 is an apocalyptic number.

It is an amenable number.

681003613 is a deficient number, since it is larger than the sum of its proper divisors (1).

681003613 is an equidigital number, since it uses as much as digits as its factorization.

681003613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 681003613 is about 26096.0459265384. The cubic root of 681003613 is about 879.7983409302.

Adding to 681003613 its reverse (316300186), we get a palindrome (997303799).

The spelling of 681003613 in words is "six hundred eighty-one million, three thousand, six hundred thirteen".