823989503 has 2 divisors, whose sum is σ = 823989504. Its totient is φ = 823989502.

The previous prime is 823989493. The next prime is 823989581. The reversal of 823989503 is 305989328.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 823989503 - 2⁸ = 823989247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823989583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411994751 + 411994752.

It is an arithmetic number, because the mean of its divisors is an integer number (411994752).

Almost surely, 2^823989503 is an apocalyptic number.

823989503 is a deficient number, since it is larger than the sum of its proper divisors (1).

823989503 is an equidigital number, since it uses as much as digits as its factorization.

823989503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 823989503 is about 28705.2173480711. The cubic root of 823989503 is about 937.5056485112.

The spelling of 823989503 in words is "eight hundred twenty-three million, nine hundred eighty-nine thousand, five hundred three".