999913009 has 2 divisors, whose sum is σ = 999913010. Its totient is φ = 999913008.

The previous prime is 999913003. The next prime is 999913039. The reversal of 999913009 is 900319999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979690000 + 20223009 = 31300^2 + 4497^2 .

It is a cyclic number.

It is not a de Polignac number, because 999913009 - 2¹⁹ = 999388721 is a prime.

It is not a weakly prime, because it can be changed into another prime (999913003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499956504 + 499956505.

It is an arithmetic number, because the mean of its divisors is an integer number (499956505).

Almost surely, 2^999913009 is an apocalyptic number.

It is an amenable number.

999913009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999913009 is an equidigital number, since it uses as much as digits as its factorization.

999913009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 999913009 is about 31621.4011232899. The cubic root of 999913009 is about 999.9710021591.

The spelling of 999913009 in words is "nine hundred ninety-nine million, nine hundred thirteen thousand, nine".