999949009 has 2 divisors, whose sum is σ = 999949010. Its totient is φ = 999949008.

The previous prime is 999949003. The next prime is 999949031. The reversal of 999949009 is 900949999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999824400 + 124609 = 31620^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 999949009 - 2³ = 999949001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999949001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499974504 + 499974505.

It is an arithmetic number, because the mean of its divisors is an integer number (499974505).

Almost surely, 2^999949009 is an apocalyptic number.

It is an amenable number.

999949009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999949009 is an equidigital number, since it uses as much as digits as its factorization.

999949009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 999949009 is about 31621.9703529050. The cubic root of 999949009 is about 999.9830027111.

The spelling of 999949009 in words is "nine hundred ninety-nine million, nine hundred forty-nine thousand, nine".