680398049 has 2 divisors, whose sum is σ = 680398050. Its totient is φ = 680398048.

The previous prime is 680398027. The next prime is 680398051. The reversal of 680398049 is 940893086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 293882449 = 19660^2 + 17143^2 .

It is a cyclic number.

It is not a de Polignac number, because 680398049 - 2¹² = 680393953 is a prime.

Together with 680398051, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 680397994 and 680398012.

It is not a weakly prime, because it can be changed into another prime (680398249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340199024 + 340199025.

It is an arithmetic number, because the mean of its divisors is an integer number (340199025).

Almost surely, 2^680398049 is an apocalyptic number.

It is an amenable number.

680398049 is a deficient number, since it is larger than the sum of its proper divisors (1).

680398049 is an equidigital number, since it uses as much as digits as its factorization.

680398049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 680398049 is about 26084.4407453946. The cubic root of 680398049 is about 879.5374846543.

The spelling of 680398049 in words is "six hundred eighty million, three hundred ninety-eight thousand, forty-nine".