681782503 has 2 divisors, whose sum is σ = 681782504. Its totient is φ = 681782502.

The previous prime is 681782483. The next prime is 681782509. The reversal of 681782503 is 305287186.

681782503 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681782503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681782509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340891251 + 340891252.

It is an arithmetic number, because the mean of its divisors is an integer number (340891252).

Almost surely, 2^681782503 is an apocalyptic number.

681782503 is a deficient number, since it is larger than the sum of its proper divisors (1).

681782503 is an equidigital number, since it uses as much as digits as its factorization.

681782503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 681782503 is about 26110.9651870627. The cubic root of 681782503 is about 880.1336328569.

The spelling of 681782503 in words is "six hundred eighty-one million, seven hundred eighty-two thousand, five hundred three".