680349349 has 2 divisors, whose sum is σ = 680349350. Its totient is φ = 680349348.

The previous prime is 680349323. The next prime is 680349353. The reversal of 680349349 is 943943086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668584449 + 11764900 = 25857^2 + 3430^2 .

It is a cyclic number.

It is not a de Polignac number, because 680349349 - 2⁷ = 680349221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 680349299 and 680349308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680349379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340174674 + 340174675.

It is an arithmetic number, because the mean of its divisors is an integer number (340174675).

Almost surely, 2^680349349 is an apocalyptic number.

It is an amenable number.

680349349 is a deficient number, since it is larger than the sum of its proper divisors (1).

680349349 is an equidigital number, since it uses as much as digits as its factorization.

680349349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 680349349 is about 26083.5072219976. The cubic root of 680349349 is about 879.5164996356.

The spelling of 680349349 in words is "six hundred eighty million, three hundred forty-nine thousand, three hundred forty-nine".