683320821 has 4 divisors (see below), whose sum is σ = 911094432. Its totient is φ = 455547212.

The previous prime is 683320819. The next prime is 683320843. The reversal of 683320821 is 128023386.

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 683320821 - 2¹ = 683320819 is a prime.

It is a super-2 number, since 2×683320821² = 933854688824228082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683320871) 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, 113886801 + ... + 113886806.

It is an arithmetic number, because the mean of its divisors is an integer number (227773608).

Almost surely, 2^683320821 is an apocalyptic number.

It is an amenable number.

683320821 is a deficient number, since it is larger than the sum of its proper divisors (227773611).

683320821 is a wasteful number, since it uses less digits than its factorization.

683320821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227773610.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 683320821 is about 26140.4059073305. The cubic root of 683320821 is about 880.7950893493.

The spelling of 683320821 in words is "six hundred eighty-three million, three hundred twenty thousand, eight hundred twenty-one".