689181 has 4 divisors (see below), whose sum is σ = 918912. Its totient is φ = 459452.

The previous prime is 689167. The next prime is 689201. The reversal of 689181 is 181986.

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 689181 - 2⁹ = 688669 is a prime.

It is a super-2 number, since 2×689181² = 949940901522, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689181.

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 3 ways as a sum of consecutive naturals, for example, 114861 + ... + 114866.

It is an arithmetic number, because the mean of its divisors is an integer number (229728).

2⁶⁸⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

689181 is a deficient number, since it is larger than the sum of its proper divisors (229731).

689181 is a wasteful number, since it uses less digits than its factorization.

689181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229730.

The product of its digits is 3456, while the sum is 33.

The square root of 689181 is about 830.1692598501. The cubic root of 689181 is about 88.3305833565.

The spelling of 689181 in words is "six hundred eighty-nine thousand, one hundred eighty-one".