681639103 has 2 divisors, whose sum is σ = 681639104. Its totient is φ = 681639102.

The previous prime is 681639061. The next prime is 681639131. The reversal of 681639103 is 301936186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681639103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681639143) 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, 340819551 + 340819552.

It is an arithmetic number, because the mean of its divisors is an integer number (340819552).

Almost surely, 2^681639103 is an apocalyptic number.

681639103 is a deficient number, since it is larger than the sum of its proper divisors (1).

681639103 is an equidigital number, since it uses as much as digits as its factorization.

681639103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 681639103 is about 26108.2190698638. The cubic root of 681639103 is about 880.0719220659.

The spelling of 681639103 in words is "six hundred eighty-one million, six hundred thirty-nine thousand, one hundred three".