999960641 has 6 divisors (see below), whose sum is σ = 1002323142. Its totient is φ = 997601280.

The previous prime is 999960613. The next prime is 999960667. The reversal of 999960641 is 146069999.

It can be written as a sum of positive squares in 3 ways, for example, as 260338225 + 739622416 = 16135^2 + 27196^2 .

It is a de Polignac number, because none of the positive numbers 2^k-999960641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999960601) 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 in 5 ways as a sum of consecutive naturals, for example, 799985 + ... + 801233.

It is an arithmetic number, because the mean of its divisors is an integer number (167053857).

Almost surely, 2^999960641 is an apocalyptic number.

It is an amenable number.

999960641 is a deficient number, since it is larger than the sum of its proper divisors (2362501).

999960641 is an frugal number, since it uses more digits than its factorization.

999960641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 999960641 is about 31622.1542751281. The cubic root of 999960641 is about 999.9868801612.

The spelling of 999960641 in words is "nine hundred ninety-nine million, nine hundred sixty thousand, six hundred forty-one".