500810081 has 2 divisors, whose sum is σ = 500810082. Its totient is φ = 500810080.

The previous prime is 500810047. The next prime is 500810099. The reversal of 500810081 is 180018005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291863056 + 208947025 = 17084^2 + 14455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500810081 is a prime.

It is a super-2 number, since 2×500810081² = 501621474462453122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (500810381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250405040 + 250405041.

It is an arithmetic number, because the mean of its divisors is an integer number (250405041).

Almost surely, 2^500810081 is an apocalyptic number.

It is an amenable number.

500810081 is a deficient number, since it is larger than the sum of its proper divisors (1).

500810081 is an equidigital number, since it uses as much as digits as its factorization.

500810081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 500810081 is about 22378.7864058800. The cubic root of 500810081 is about 794.1289358467.

Adding to 500810081 its reverse (180018005), we get a palindrome (680828086).

The spelling of 500810081 in words is "five hundred million, eight hundred ten thousand, eighty-one".