683793821 has 2 divisors, whose sum is σ = 683793822. Its totient is φ = 683793820.

The previous prime is 683793791. The next prime is 683793823. The reversal of 683793821 is 128397386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566916100 + 116877721 = 23810^2 + 10811^2 .

It is a cyclic number.

It is not a de Polignac number, because 683793821 - 2²² = 679599517 is a prime.

Together with 683793823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (683793823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341896910 + 341896911.

It is an arithmetic number, because the mean of its divisors is an integer number (341896911).

Almost surely, 2^683793821 is an apocalyptic number.

It is an amenable number.

683793821 is a deficient number, since it is larger than the sum of its proper divisors (1).

683793821 is an equidigital number, since it uses as much as digits as its factorization.

683793821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 683793821 is about 26149.4516386099. The cubic root of 683793821 is about 880.9982735507.

The spelling of 683793821 in words is "six hundred eighty-three million, seven hundred ninety-three thousand, eight hundred twenty-one".