689155 has 4 divisors (see below), whose sum is σ = 826992. Its totient is φ = 551320.

The previous prime is 689141. The next prime is 689167. The reversal of 689155 is 551986.

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

It is not a de Polignac number, because 689155 - 2¹¹ = 687107 is a prime.

It is a super-2 number, since 2×689155² = 949869228050, which contains 22 as substring.

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 689155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68911 + ... + 68920.

It is an arithmetic number, because the mean of its divisors is an integer number (206748).

2⁶⁸⁹¹⁵⁵ is an apocalyptic number.

689155 is a deficient number, since it is larger than the sum of its proper divisors (137837).

689155 is a wasteful number, since it uses less digits than its factorization.

689155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137836.

The product of its digits is 10800, while the sum is 34.

The square root of 689155 is about 830.1536002452. The cubic root of 689155 is about 88.3294725578.

The spelling of 689155 in words is "six hundred eighty-nine thousand, one hundred fifty-five".