689656249 has 4 divisors (see below), whose sum is σ = 692542080. Its totient is φ = 686770420.

The previous prime is 689656229. The next prime is 689656273. The reversal of 689656249 is 942656986.

It is a happy number.

689656249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689656249 - 2⁵ = 689656217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689656249.

It is not an unprimeable number, because it can be changed into a prime (689656229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442557 + ... + 1443034.

It is an arithmetic number, because the mean of its divisors is an integer number (173135520).

Almost surely, 2^689656249 is an apocalyptic number.

It is an amenable number.

689656249 is a deficient number, since it is larger than the sum of its proper divisors (2885831).

689656249 is a wasteful number, since it uses less digits than its factorization.

689656249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885830.

The product of its digits is 5598720, while the sum is 55.

The square root of 689656249 is about 26261.3070695272. The cubic root of 689656249 is about 883.5088251146.

The spelling of 689656249 in words is "six hundred eighty-nine million, six hundred fifty-six thousand, two hundred forty-nine".