994686409 has 2 divisors, whose sum is σ = 994686410. Its totient is φ = 994686408.

The previous prime is 994686401. The next prime is 994686437. The reversal of 994686409 is 904686499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 960814009 + 33872400 = 30997^2 + 5820^2 .

It is an emirp because it is prime and its reverse (904686499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994686409 - 2³ = 994686401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 994686409.

It is not a weakly prime, because it can be changed into another prime (994686401) 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, 497343204 + 497343205.

It is an arithmetic number, because the mean of its divisors is an integer number (497343205).

Almost surely, 2^994686409 is an apocalyptic number.

It is an amenable number.

994686409 is a deficient number, since it is larger than the sum of its proper divisors (1).

994686409 is an equidigital number, since it uses as much as digits as its factorization.

994686409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The square root of 994686409 is about 31538.6494479393. The cubic root of 994686409 is about 998.2256565674.

The spelling of 994686409 in words is "nine hundred ninety-four million, six hundred eighty-six thousand, four hundred nine".