51903 has 12 divisors (see below), whose sum is σ = 76960. Its totient is φ = 33696.

The previous prime is 51899. The next prime is 51907. The reversal of 51903 is 30915.

It is an interprime number because it is at equal distance from previous prime (51899) and next prime (51907).

It is not a de Polignac number, because 51903 - 2² = 51899 is a prime.

It is a Duffinian number.

51903 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618 + ... + 696.

2⁵¹⁹⁰³ is an apocalyptic number.

51903 is a deficient number, since it is larger than the sum of its proper divisors (25057).

51903 is a wasteful number, since it uses less digits than its factorization.

51903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 51903 is about 227.8222991720. The cubic root of 51903 is about 37.3018885593.

The spelling of 51903 in words is "fifty-one thousand, nine hundred three".