813083221 has 8 divisors (see below), whose sum is σ = 857170944. Its totient is φ = 770111760.

The previous prime is 813083209. The next prime is 813083231. The reversal of 813083221 is 122380318.

813083221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 813083221 - 2⁹ = 813082709 is a prime.

It is a super-2 number, since 2×813083221² = 1322208648543469682, 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 813083221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813083231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277570 + ... + 280483.

It is an arithmetic number, because the mean of its divisors is an integer number (107146368).

Almost surely, 2^813083221 is an apocalyptic number.

It is an amenable number.

813083221 is a deficient number, since it is larger than the sum of its proper divisors (44087723).

813083221 is a wasteful number, since it uses less digits than its factorization.

813083221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558131.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 813083221 is about 28514.6141653714. The cubic root of 813083221 is about 933.3510054335.

The spelling of 813083221 in words is "eight hundred thirteen million, eighty-three thousand, two hundred twenty-one".