687718903 has 2 divisors, whose sum is σ = 687718904. Its totient is φ = 687718902.

The previous prime is 687718897. The next prime is 687718907. The reversal of 687718903 is 309817786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687718903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687718907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343859451 + 343859452.

It is an arithmetic number, because the mean of its divisors is an integer number (343859452).

Almost surely, 2^687718903 is an apocalyptic number.

687718903 is a deficient number, since it is larger than the sum of its proper divisors (1).

687718903 is an equidigital number, since it uses as much as digits as its factorization.

687718903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 687718903 is about 26224.3951884500. The cubic root of 687718903 is about 882.6807470842.

The spelling of 687718903 in words is "six hundred eighty-seven million, seven hundred eighteen thousand, nine hundred three".