680834389 has 2 divisors, whose sum is σ = 680834390. Its totient is φ = 680834388.

The previous prime is 680834321. The next prime is 680834417. The reversal of 680834389 is 983438086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620508100 + 60326289 = 24910^2 + 7767^2 .

It is a cyclic number.

It is not a de Polignac number, because 680834389 - 2⁹ = 680833877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680834489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340417194 + 340417195.

It is an arithmetic number, because the mean of its divisors is an integer number (340417195).

Almost surely, 2^680834389 is an apocalyptic number.

It is an amenable number.

680834389 is a deficient number, since it is larger than the sum of its proper divisors (1).

680834389 is an equidigital number, since it uses as much as digits as its factorization.

680834389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 680834389 is about 26092.8033948060. The cubic root of 680834389 is about 879.7254605884.

The spelling of 680834389 in words is "six hundred eighty million, eight hundred thirty-four thousand, three hundred eighty-nine".