801311221 has 4 divisors (see below), whose sum is σ = 805788000. Its totient is φ = 796834444.

The previous prime is 801311207. The next prime is 801311239. The reversal of 801311221 is 122113108.

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 801311221 - 2⁹ = 801310709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801311821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2238121 + ... + 2238478.

It is an arithmetic number, because the mean of its divisors is an integer number (201447000).

Almost surely, 2^801311221 is an apocalyptic number.

It is an amenable number.

801311221 is a deficient number, since it is larger than the sum of its proper divisors (4476779).

801311221 is a wasteful number, since it uses less digits than its factorization.

801311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476778.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 801311221 is about 28307.4410888727. The cubic root of 801311221 is about 928.8246689440.

Adding to 801311221 its reverse (122113108), we get a palindrome (923424329).

The spelling of 801311221 in words is "eight hundred one million, three hundred eleven thousand, two hundred twenty-one".