999964649 has 2 divisors, whose sum is σ = 999964650. Its totient is φ = 999964648.

The previous prime is 999964597. The next prime is 999964663. The reversal of 999964649 is 946469999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 806560000 + 193404649 = 28400^2 + 13907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999964649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999964549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499982324 + 499982325.

It is an arithmetic number, because the mean of its divisors is an integer number (499982325).

Almost surely, 2^999964649 is an apocalyptic number.

It is an amenable number.

999964649 is a deficient number, since it is larger than the sum of its proper divisors (1).

999964649 is an equidigital number, since it uses as much as digits as its factorization.

999964649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 65.

The square root of 999964649 is about 31622.2176483560. The cubic root of 999964649 is about 999.9882161945.

The spelling of 999964649 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, six hundred forty-nine".