800921001 has 32 divisors (see below), whose sum is σ = 1108546560. Its totient is φ = 514115264.

The previous prime is 800920999. The next prime is 800921029. The reversal of 800921001 is 100129008.

It is not a de Polignac number, because 800921001 - 2¹ = 800920999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (800921081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3045196 + ... + 3045458.

It is an arithmetic number, because the mean of its divisors is an integer number (34642080).

Almost surely, 2^800921001 is an apocalyptic number.

It is an amenable number.

800921001 is a deficient number, since it is larger than the sum of its proper divisors (307625559).

800921001 is a wasteful number, since it uses less digits than its factorization.

800921001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 800921001 is about 28300.5477155478. The cubic root of 800921001 is about 928.6738724316.

The spelling of 800921001 in words is "eight hundred million, nine hundred twenty-one thousand, one".