810500081 has 8 divisors (see below), whose sum is σ = 857875200. Its totient is φ = 763596720.

The previous prime is 810500029. The next prime is 810500153. The reversal of 810500081 is 180005018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 810500081 - 2⁶ = 810500017 is a prime.

It is a super-2 number, since 2×810500081² = 1313820762602013122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810500021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114401 + ... + 121278.

It is an arithmetic number, because the mean of its divisors is an integer number (107234400).

Almost surely, 2^810500081 is an apocalyptic number.

It is an amenable number.

810500081 is a deficient number, since it is larger than the sum of its proper divisors (47375119).

810500081 is a wasteful number, since it uses less digits than its factorization.

810500081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235879.

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

The square root of 810500081 is about 28469.2831135594. The cubic root of 810500081 is about 932.3615478690.

Adding to 810500081 its reverse (180005018), we get a palindrome (990505099).

The spelling of 810500081 in words is "eight hundred ten million, five hundred thousand, eighty-one".