487173809 has 2 divisors, whose sum is σ = 487173810. Its totient is φ = 487173808.

The previous prime is 487173779. The next prime is 487173823. The reversal of 487173809 is 908371784.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487173184 + 625 = 22072^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 487173809 - 2²⁸ = 218738353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (487173839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243586904 + 243586905.

It is an arithmetic number, because the mean of its divisors is an integer number (243586905).

Almost surely, 2^487173809 is an apocalyptic number.

It is an amenable number.

487173809 is a deficient number, since it is larger than the sum of its proper divisors (1).

487173809 is an equidigital number, since it uses as much as digits as its factorization.

487173809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 487173809 is about 22072.0141582050. The cubic root of 487173809 is about 786.8548825674.

The spelling of 487173809 in words is "four hundred eighty-seven million, one hundred seventy-three thousand, eight hundred nine".