990503 has 2 divisors, whose sum is σ = 990504. Its totient is φ = 990502.

The previous prime is 990497. The next prime is 990511. The reversal of 990503 is 305099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990503 - 2⁴ = 990487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495251 + 495252.

It is an arithmetic number, because the mean of its divisors is an integer number (495252).

2⁹⁹⁰⁵⁰³ is an apocalyptic number.

990503 is a deficient number, since it is larger than the sum of its proper divisors (1).

990503 is an equidigital number, since it uses as much as digits as its factorization.

990503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 26.

The square root of 990503 is about 995.2401720188. The cubic root of 990503 is about 99.6824258677.

The spelling of 990503 in words is "nine hundred ninety thousand, five hundred three".