689849617 has 2 divisors, whose sum is σ = 689849618. Its totient is φ = 689849616.

The previous prime is 689849543. The next prime is 689849639. The reversal of 689849617 is 716948986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647651601 + 42198016 = 25449^2 + 6496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689849617 is a prime.

It is not a weakly prime, because it can be changed into another prime (689849687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344924808 + 344924809.

It is an arithmetic number, because the mean of its divisors is an integer number (344924809).

Almost surely, 2^689849617 is an apocalyptic number.

It is an amenable number.

689849617 is a deficient number, since it is larger than the sum of its proper divisors (1).

689849617 is an equidigital number, since it uses as much as digits as its factorization.

689849617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 58.

The square root of 689849617 is about 26264.9884256590. The cubic root of 689849617 is about 883.5913910644.

The spelling of 689849617 in words is "six hundred eighty-nine million, eight hundred forty-nine thousand, six hundred seventeen".