689420917 has 2 divisors, whose sum is σ = 689420918. Its totient is φ = 689420916.

The previous prime is 689420911. The next prime is 689420939. The reversal of 689420917 is 719024986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484616196 + 204804721 = 22014^2 + 14311^2 .

It is a cyclic number.

It is not a de Polignac number, because 689420917 - 2¹⁵ = 689388149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689420911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344710458 + 344710459.

It is an arithmetic number, because the mean of its divisors is an integer number (344710459).

Almost surely, 2^689420917 is an apocalyptic number.

It is an amenable number.

689420917 is a deficient number, since it is larger than the sum of its proper divisors (1).

689420917 is an equidigital number, since it uses as much as digits as its factorization.

689420917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 689420917 is about 26256.8261029394. The cubic root of 689420917 is about 883.4083201877.

The spelling of 689420917 in words is "six hundred eighty-nine million, four hundred twenty thousand, nine hundred seventeen".