680434091 has 2 divisors, whose sum is σ = 680434092. Its totient is φ = 680434090.

The previous prime is 680434067. The next prime is 680434147. The reversal of 680434091 is 190434086.

680434091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680434091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (680434891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340217045 + 340217046.

It is an arithmetic number, because the mean of its divisors is an integer number (340217046).

Almost surely, 2^680434091 is an apocalyptic number.

680434091 is a deficient number, since it is larger than the sum of its proper divisors (1).

680434091 is an equidigital number, since it uses as much as digits as its factorization.

680434091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 680434091 is about 26085.1316078719. The cubic root of 680434091 is about 879.5530146471.

The spelling of 680434091 in words is "six hundred eighty million, four hundred thirty-four thousand, ninety-one".