994427784109 has 2 divisors, whose sum is σ = 994427784110. Its totient is φ = 994427784108.

The previous prime is 994427784071. The next prime is 994427784257. The reversal of 994427784109 is 901487724499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994427784100 + 9 = 997210^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 994427784109 - 2⁹ = 994427783597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994427784409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497213892054 + 497213892055.

It is an arithmetic number, because the mean of its divisors is an integer number (497213892055).

Almost surely, 2^994427784109 is an apocalyptic number.

It is an amenable number.

994427784109 is a deficient number, since it is larger than the sum of its proper divisors (1).

994427784109 is an equidigital number, since it uses as much as digits as its factorization.

994427784109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 994427784109 in words is "nine hundred ninety-four billion, four hundred twenty-seven million, seven hundred eighty-four thousand, one hundred nine".