47009909 has 2 divisors, whose sum is σ = 47009910. Its totient is φ = 47009908.

The previous prime is 47009891. The next prime is 47009923. The reversal of 47009909 is 90990074.

47009909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33097009 + 13912900 = 5753^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 47009909 - 2⁸ = 47009653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47009959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23504954 + 23504955.

It is an arithmetic number, because the mean of its divisors is an integer number (23504955).

Almost surely, 2^47009909 is an apocalyptic number.

It is an amenable number.

47009909 is a deficient number, since it is larger than the sum of its proper divisors (1).

47009909 is an equidigital number, since it uses as much as digits as its factorization.

47009909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 47009909 is about 6856.3772504144. The cubic root of 47009909 is about 360.9079678329.

The spelling of 47009909 in words is "forty-seven million, nine thousand, nine hundred nine".