999994309 has 2 divisors, whose sum is σ = 999994310. Its totient is φ = 999994308.

The previous prime is 999994297. The next prime is 999994313. The reversal of 999994309 is 903499999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970509409 + 29484900 = 31153^2 + 5430^2 .

It is a cyclic number.

It is not a de Polignac number, because 999994309 - 2⁵ = 999994277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999994379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997154 + 499997155.

It is an arithmetic number, because the mean of its divisors is an integer number (499997155).

Almost surely, 2^999994309 is an apocalyptic number.

It is an amenable number.

999994309 is a deficient number, since it is larger than the sum of its proper divisors (1).

999994309 is an equidigital number, since it uses as much as digits as its factorization.

999994309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6377292, while the sum is 61.

The square root of 999994309 is about 31622.6866189450. The cubic root of 999994309 is about 999.9981029964.

The spelling of 999994309 in words is "nine hundred ninety-nine million, nine hundred ninety-four thousand, three hundred nine".