999648449 has 2 divisors, whose sum is σ = 999648450. Its totient is φ = 999648448.

The previous prime is 999648443. The next prime is 999648469. The reversal of 999648449 is 944846999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931470400 + 68178049 = 30520^2 + 8257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999648449 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999648391 and 999648400.

It is not a weakly prime, because it can be changed into another prime (999648443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499824224 + 499824225.

It is an arithmetic number, because the mean of its divisors is an integer number (499824225).

Almost surely, 2^999648449 is an apocalyptic number.

It is an amenable number.

999648449 is a deficient number, since it is larger than the sum of its proper divisors (1).

999648449 is an equidigital number, since it uses as much as digits as its factorization.

999648449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 62.

The square root of 999648449 is about 31617.2176037045. The cubic root of 999648449 is about 999.8828025986.

The spelling of 999648449 in words is "nine hundred ninety-nine million, six hundred forty-eight thousand, four hundred forty-nine".