689310549 has 12 divisors (see below), whose sum is σ = 997292556. Its totient is φ = 458791872.

The previous prime is 689310533. The next prime is 689310551. The reversal of 689310549 is 945013986.

It is a happy number.

689310549 is a `hidden beast` number, since 6 + 8 + 93 + 10 + 549 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 132020100 + 557290449 = 11490^2 + 23607^2 .

It is not a de Polignac number, because 689310549 - 2⁴ = 689310533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689310049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56514 + ... + 67619.

It is an arithmetic number, because the mean of its divisors is an integer number (83107713).

Almost surely, 2^689310549 is an apocalyptic number.

It is an amenable number.

689310549 is a deficient number, since it is larger than the sum of its proper divisors (307982007).

689310549 is a wasteful number, since it uses less digits than its factorization.

689310549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124756 (or 124753 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 689310549 is about 26254.7243177299. The cubic root of 689310549 is about 883.3611766549.

The spelling of 689310549 in words is "six hundred eighty-nine million, three hundred ten thousand, five hundred forty-nine".