999603641 has 2 divisors, whose sum is σ = 999603642. Its totient is φ = 999603640.

The previous prime is 999603629. The next prime is 999603659. The reversal of 999603641 is 146306999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996349225 + 3254416 = 31565^2 + 1804^2 .

It is an emirp because it is prime and its reverse (146306999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999603641 - 2²⁶ = 932494777 is a prime.

It is a super-3 number, since 3×999603641³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (999603041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499801820 + 499801821.

It is an arithmetic number, because the mean of its divisors is an integer number (499801821).

Almost surely, 2^999603641 is an apocalyptic number.

It is an amenable number.

999603641 is a deficient number, since it is larger than the sum of its proper divisors (1).

999603641 is an equidigital number, since it uses as much as digits as its factorization.

999603641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 999603641 is about 31616.5089945111. The cubic root of 999603641 is about 999.8678628739.

The spelling of 999603641 in words is "nine hundred ninety-nine million, six hundred three thousand, six hundred forty-one".