810009001 has 8 divisors (see below), whose sum is σ = 818616960. Its totient is φ = 801445008.

The previous prime is 810008999. The next prime is 810009023. The reversal of 810009001 is 100900018.

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 810009001 - 2¹ = 810008999 is a prime.

It is a super-2 number, since 2×810009001² = 1312229163402036002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 810009001.

It is not an unprimeable number, because it can be changed into a prime (810009091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26730 + ... + 48316.

It is an arithmetic number, because the mean of its divisors is an integer number (102327120).

Almost surely, 2^810009001 is an apocalyptic number.

It is an amenable number.

810009001 is a deficient number, since it is larger than the sum of its proper divisors (8607959).

810009001 is a wasteful number, since it uses less digits than its factorization.

810009001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21983.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 810009001 is about 28460.6570725273. The cubic root of 810009001 is about 932.1732046375.

Adding to 810009001 its reverse (100900018), we get a palindrome (910909019).

The spelling of 810009001 in words is "eight hundred ten million, nine thousand, one".