5171820809 has 2 divisors, whose sum is σ = 5171820810. Its totient is φ = 5171820808.

The previous prime is 5171820803. The next prime is 5171820943. The reversal of 5171820809 is 9080281715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4994531584 + 177289225 = 70672^2 + 13315^2 .

It is a cyclic number.

It is not a de Polignac number, because 5171820809 - 2¹⁶ = 5171755273 is a prime.

It is not a weakly prime, because it can be changed into another prime (5171820803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2585910404 + 2585910405.

It is an arithmetic number, because the mean of its divisors is an integer number (2585910405).

Almost surely, 2^5171820809 is an apocalyptic number.

It is an amenable number.

5171820809 is a deficient number, since it is larger than the sum of its proper divisors (1).

5171820809 is an equidigital number, since it uses as much as digits as its factorization.

5171820809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 5171820809 is about 71915.3725499632. The cubic root of 5171820809 is about 1729.3430640808.

It can be divided in two parts, 51718 and 20809, that added together give a palindrome (72527).

The spelling of 5171820809 in words is "five billion, one hundred seventy-one million, eight hundred twenty thousand, eight hundred nine".