680944321 has 2 divisors, whose sum is σ = 680944322. Its totient is φ = 680944320.

The previous prime is 680944309. The next prime is 680944343. The reversal of 680944321 is 123449086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571449025 + 109495296 = 23905^2 + 10464^2 .

It is a cyclic number.

It is not a de Polignac number, because 680944321 - 2⁵ = 680944289 is a prime.

It is not a weakly prime, because it can be changed into another prime (680944301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340472160 + 340472161.

It is an arithmetic number, because the mean of its divisors is an integer number (340472161).

Almost surely, 2^680944321 is an apocalyptic number.

It is an amenable number.

680944321 is a deficient number, since it is larger than the sum of its proper divisors (1).

680944321 is an equidigital number, since it uses as much as digits as its factorization.

680944321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 680944321 is about 26094.9098676351. The cubic root of 680944321 is about 879.7728067939.

The spelling of 680944321 in words is "six hundred eighty million, nine hundred forty-four thousand, three hundred twenty-one".