680498209 has 2 divisors, whose sum is σ = 680498210. Its totient is φ = 680498208.

The previous prime is 680498201. The next prime is 680498239. The reversal of 680498209 is 902894086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628254225 + 52243984 = 25065^2 + 7228^2 .

It is a cyclic number.

It is not a de Polignac number, because 680498209 - 2³ = 680498201 is a prime.

It is not a weakly prime, because it can be changed into another prime (680498201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340249104 + 340249105.

It is an arithmetic number, because the mean of its divisors is an integer number (340249105).

Almost surely, 2^680498209 is an apocalyptic number.

It is an amenable number.

680498209 is a deficient number, since it is larger than the sum of its proper divisors (1).

680498209 is an equidigital number, since it uses as much as digits as its factorization.

680498209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 680498209 is about 26086.3605932296. The cubic root of 680498209 is about 879.5806408393.

The spelling of 680498209 in words is "six hundred eighty million, four hundred ninety-eight thousand, two hundred nine".