999970009 has 2 divisors, whose sum is σ = 999970010. Its totient is φ = 999970008.

The previous prime is 999970003. The next prime is 999970043. The reversal of 999970009 is 900079999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656794384 + 343175625 = 25628^2 + 18525^2 .

It is a cyclic number.

It is not a de Polignac number, because 999970009 - 2²⁷ = 865752281 is a prime.

It is not a weakly prime, because it can be changed into another prime (999970003) 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, 499985004 + 499985005.

It is an arithmetic number, because the mean of its divisors is an integer number (499985005).

Almost surely, 2^999970009 is an apocalyptic number.

It is an amenable number.

999970009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999970009 is an equidigital number, since it uses as much as digits as its factorization.

999970009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 413343, while the sum is 52.

The square root of 999970009 is about 31622.3023987818. The cubic root of 999970009 is about 999.9900029001.

It can be divided in two parts, 9999 and 70009, that added together give a palindrome (80008).

The spelling of 999970009 in words is "nine hundred ninety-nine million, nine hundred seventy thousand, nine".