47391209 has 2 divisors, whose sum is σ = 47391210. Its totient is φ = 47391208.

The previous prime is 47391173. The next prime is 47391221. The reversal of 47391209 is 90219374.

47391209 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., 34810000 + 12581209 = 5900^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 47391209 - 2¹² = 47387113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47391269) 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, 23695604 + 23695605.

It is an arithmetic number, because the mean of its divisors is an integer number (23695605).

Almost surely, 2^47391209 is an apocalyptic number.

It is an amenable number.

47391209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47391209 is an equidigital number, since it uses as much as digits as its factorization.

47391209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 47391209 is about 6884.1273230526. The cubic root of 47391209 is about 361.8811230188.

The spelling of 47391209 in words is "forty-seven million, three hundred ninety-one thousand, two hundred nine".