471291809 has 2 divisors, whose sum is σ = 471291810. Its totient is φ = 471291808.

The previous prime is 471291787. The next prime is 471291811. The reversal of 471291809 is 908192174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464531809 + 6760000 = 21553^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-471291809 is a prime.

It is a Sophie Germain prime.

Together with 471291811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (471291859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235645904 + 235645905.

It is an arithmetic number, because the mean of its divisors is an integer number (235645905).

Almost surely, 2^471291809 is an apocalyptic number.

It is an amenable number.

471291809 is a deficient number, since it is larger than the sum of its proper divisors (1).

471291809 is an equidigital number, since it uses as much as digits as its factorization.

471291809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 471291809 is about 21709.2562977178. The cubic root of 471291809 is about 778.2096835928.

The spelling of 471291809 in words is "four hundred seventy-one million, two hundred ninety-one thousand, eight hundred nine".