689991713 has 2 divisors, whose sum is σ = 689991714. Its totient is φ = 689991712.

The previous prime is 689991689. The next prime is 689991761. The reversal of 689991713 is 317199986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 683979409 + 6012304 = 26153^2 + 2452^2 .

It is a cyclic number.

It is not a de Polignac number, because 689991713 - 2⁶ = 689991649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (689991773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344995856 + 344995857.

It is an arithmetic number, because the mean of its divisors is an integer number (344995857).

Almost surely, 2^689991713 is an apocalyptic number.

It is an amenable number.

689991713 is a deficient number, since it is larger than the sum of its proper divisors (1).

689991713 is an equidigital number, since it uses as much as digits as its factorization.

689991713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 689991713 is about 26267.6933323046. The cubic root of 689991713 is about 883.6520546156.

The spelling of 689991713 in words is "six hundred eighty-nine million, nine hundred ninety-one thousand, seven hundred thirteen".