999665941 has 2 divisors, whose sum is σ = 999665942. Its totient is φ = 999665940.

The previous prime is 999665911. The next prime is 999665971. The reversal of 999665941 is 149566999.

It is a balanced prime because it is at equal distance from previous prime (999665911) and next prime (999665971).

It can be written as a sum of positive squares in only one way, i.e., 934524900 + 65141041 = 30570^2 + 8071^2 .

It is a cyclic number.

It is not a de Polignac number, because 999665941 - 2¹¹ = 999663893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999665911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499832970 + 499832971.

It is an arithmetic number, because the mean of its divisors is an integer number (499832971).

Almost surely, 2^999665941 is an apocalyptic number.

It is an amenable number.

999665941 is a deficient number, since it is larger than the sum of its proper divisors (1).

999665941 is an equidigital number, since it uses as much as digits as its factorization.

999665941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 58.

The square root of 999665941 is about 31617.4942239261. The cubic root of 999665941 is about 999.8886345982. Note that the first 3 decimals are identical.

The spelling of 999665941 in words is "nine hundred ninety-nine million, six hundred sixty-five thousand, nine hundred forty-one".