689121 has 8 divisors (see below), whose sum is σ = 1020960. Its totient is φ = 459396.

The previous prime is 689113. The next prime is 689131. The reversal of 689121 is 121986.

It is not a de Polignac number, because 689121 - 2³ = 689113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25523 = 689121 / (6 + 8 + 9 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (689131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12735 + ... + 12788.

It is an arithmetic number, because the mean of its divisors is an integer number (127620).

2⁶⁸⁹¹²¹ is an apocalyptic number.

It is an amenable number.

689121 is a deficient number, since it is larger than the sum of its proper divisors (331839).

689121 is a wasteful number, since it uses less digits than its factorization.

689121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25532 (or 25526 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 689121 is about 830.1331218546. The cubic root of 689121 is about 88.3280199328.

The spelling of 689121 in words is "six hundred eighty-nine thousand, one hundred twenty-one".