990000503 has 2 divisors, whose sum is σ = 990000504. Its totient is φ = 990000502.

The previous prime is 990000467. The next prime is 990000547. The reversal of 990000503 is 305000099.

It is a weak prime.

It is an emirp because it is prime and its reverse (305000099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990000503 - 2⁶ = 990000439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990020503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495000251 + 495000252.

It is an arithmetic number, because the mean of its divisors is an integer number (495000252).

Almost surely, 2^990000503 is an apocalyptic number.

990000503 is a deficient number, since it is larger than the sum of its proper divisors (1).

990000503 is an equidigital number, since it uses as much as digits as its factorization.

990000503 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 990000503 is about 31464.2734382982. The cubic root of 990000503 is about 996.6556622064.

The spelling of 990000503 in words is "nine hundred ninety million, five hundred three", and thus it is an aban number.