689955289 has 3 divisors (see below), whose sum is σ = 689981557. Its totient is φ = 689929022.

The previous prime is 689955283. The next prime is 689955359. The reversal of 689955289 is 982559986.

The square root of 689955289 is 26267.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 689955289 - 2³ = 689955281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689955281) 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 in 2 ways as a sum of consecutive naturals, for example, 13134 + ... + 39400.

Almost surely, 2^689955289 is an apocalyptic number.

689955289 is the 26267-th square number.

689955289 is the 13134-th centered octagonal number.

It is an amenable number.

689955289 is a deficient number, since it is larger than the sum of its proper divisors (26268).

689955289 is an frugal number, since it uses more digits than its factorization.

689955289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52534 (or 26267 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 61.

The cubic root of 689955289 is about 883.6365052942.

The spelling of 689955289 in words is "six hundred eighty-nine million, nine hundred fifty-five thousand, two hundred eighty-nine".