681903 has 6 divisors (see below), whose sum is σ = 984984. Its totient is φ = 454596.

The previous prime is 681899. The next prime is 681913. The reversal of 681903 is 309186.

It is not a de Polignac number, because 681903 - 2² = 681899 is a prime.

681903 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37875 + ... + 37892.

It is an arithmetic number, because the mean of its divisors is an integer number (164164).

2⁶⁸¹⁹⁰³ is an apocalyptic number.

681903 is a deficient number, since it is larger than the sum of its proper divisors (303081).

681903 is a wasteful number, since it uses less digits than its factorization.

681903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75773 (or 75770 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 681903 is about 825.7741822072. The cubic root of 681903 is about 88.0185480875.

The spelling of 681903 in words is "six hundred eighty-one thousand, nine hundred three".