4394081009 has 2 divisors, whose sum is σ = 4394081010. Its totient is φ = 4394081008.

The previous prime is 4394080981. The next prime is 4394081047. The reversal of 4394081009 is 9001804934.

It is an a-pointer prime, because the next prime (4394081047) can be obtained adding 4394081009 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4195411984 + 198669025 = 64772^2 + 14095^2 .

It is a cyclic number.

It is not a de Polignac number, because 4394081009 - 2⁸ = 4394080753 is a prime.

It is not a weakly prime, because it can be changed into another prime (4394081099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2197040504 + 2197040505.

It is an arithmetic number, because the mean of its divisors is an integer number (2197040505).

Almost surely, 2^4394081009 is an apocalyptic number.

It is an amenable number.

4394081009 is a deficient number, since it is larger than the sum of its proper divisors (1).

4394081009 is an equidigital number, since it uses as much as digits as its factorization.

4394081009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 4394081009 is about 66287.8647189665. The cubic root of 4394081009 is about 1637.9074303778.

The spelling of 4394081009 in words is "four billion, three hundred ninety-four million, eighty-one thousand, nine".