810005001 has 24 divisors (see below), whose sum is σ = 1238280480. Its totient is φ = 469138176.

The previous prime is 810004997. The next prime is 810005011. The reversal of 810005001 is 100500018.

It is a happy number.

It is not a de Polignac number, because 810005001 - 2² = 810004997 is a prime.

It is a super-2 number, since 2×810005001² = 1312216203290020002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810005011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38371 + ... + 55608.

It is an arithmetic number, because the mean of its divisors is an integer number (51595020).

Almost surely, 2^810005001 is an apocalyptic number.

It is an amenable number.

810005001 is a deficient number, since it is larger than the sum of its proper divisors (428275479).

810005001 is a wasteful number, since it uses less digits than its factorization.

810005001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94025 (or 94012 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 810005001 is about 28460.5867999941. The cubic root of 810005001 is about 932.1716702106.

Adding to 810005001 its reverse (100500018), we get a palindrome (910505019).

The spelling of 810005001 in words is "eight hundred ten million, five thousand, one".