51503 has 2 divisors, whose sum is σ = 51504. Its totient is φ = 51502.

The previous prime is 51487. The next prime is 51511. The reversal of 51503 is 30515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51503 - 2⁴ = 51487 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 8 and base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25751 + 25752.

It is an arithmetic number, because the mean of its divisors is an integer number (25752).

2⁵¹⁵⁰³ is an apocalyptic number.

51503 is a deficient number, since it is larger than the sum of its proper divisors (1).

51503 is an equidigital number, since it uses as much as digits as its factorization.

51503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75, while the sum is 14.

The square root of 51503 is about 226.9427240517. The cubic root of 51503 is about 37.2058167187.

The spelling of 51503 in words is "fifty-one thousand, five hundred three".