801640217 has 4 divisors (see below), whose sum is σ = 916160256. Its totient is φ = 687120180.

The previous prime is 801640207. The next prime is 801640277. The reversal of 801640217 is 712046108.

801640217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 801640217 - 2⁴ = 801640201 is a prime.

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 801640217.

It is not an unprimeable number, because it can be changed into a prime (801640207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57260009 + ... + 57260022.

It is an arithmetic number, because the mean of its divisors is an integer number (229040064).

Almost surely, 2^801640217 is an apocalyptic number.

It is an amenable number.

801640217 is a deficient number, since it is larger than the sum of its proper divisors (114520039).

801640217 is a wasteful number, since it uses less digits than its factorization.

801640217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114520038.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 801640217 is about 28313.2516147475. The cubic root of 801640217 is about 928.9517680375.

The spelling of 801640217 in words is "eight hundred one million, six hundred forty thousand, two hundred seventeen".