689569 has 4 divisors (see below), whose sum is σ = 708244. Its totient is φ = 670896.

The previous prime is 689561. The next prime is 689581. The reversal of 689569 is 965986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 439569 = 500^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 689569 - 2³ = 689561 is a prime.

It is a super-2 number, since 2×689569² = 951010811522, which contains 22 as substring.

It is a Duffinian number.

689569 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (689561) 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, 9282 + ... + 9355.

It is an arithmetic number, because the mean of its divisors is an integer number (177061).

2⁶⁸⁹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

689569 is a deficient number, since it is larger than the sum of its proper divisors (18675).

689569 is a wasteful number, since it uses less digits than its factorization.

689569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18674.

The product of its digits is 116640, while the sum is 43.

The square root of 689569 is about 830.4029142531. The cubic root of 689569 is about 88.3471565725.

The spelling of 689569 in words is "six hundred eighty-nine thousand, five hundred sixty-nine".