999987503 has 2 divisors, whose sum is σ = 999987504. Its totient is φ = 999987502.

The previous prime is 999987497. The next prime is 999987601. The reversal of 999987503 is 305789999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999987503 - 2⁴ = 999987487 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 (999987103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993751 + 499993752.

It is an arithmetic number, because the mean of its divisors is an integer number (499993752).

Almost surely, 2^999987503 is an apocalyptic number.

999987503 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987503 is an equidigital number, since it uses as much as digits as its factorization.

999987503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 59.

The square root of 999987503 is about 31622.5790061469. The cubic root of 999987503 is about 999.9958343160.

The spelling of 999987503 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, five hundred three".