999696641 has 2 divisors, whose sum is σ = 999696642. Its totient is φ = 999696640.

The previous prime is 999696631. The next prime is 999696667. The reversal of 999696641 is 146696999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889530625 + 110166016 = 29825^2 + 10496^2 .

It is an emirp because it is prime and its reverse (146696999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999696641 is a prime.

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 (999696631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499848320 + 499848321.

It is an arithmetic number, because the mean of its divisors is an integer number (499848321).

Almost surely, 2^999696641 is an apocalyptic number.

It is an amenable number.

999696641 is a deficient number, since it is larger than the sum of its proper divisors (1).

999696641 is an equidigital number, since it uses as much as digits as its factorization.

999696641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 59.

The square root of 999696641 is about 31617.9797109176. The cubic root of 999696641 is about 999.8988701064.

The spelling of 999696641 in words is "nine hundred ninety-nine million, six hundred ninety-six thousand, six hundred forty-one".