289661 has 4 divisors (see below), whose sum is σ = 295872. Its totient is φ = 283452.

The previous prime is 289657. The next prime is 289669. The reversal of 289661 is 166982.

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 289661 - 2² = 289657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289669) 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, 3035 + ... + 3128.

It is an arithmetic number, because the mean of its divisors is an integer number (73968).

2²⁸⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

289661 is a deficient number, since it is larger than the sum of its proper divisors (6211).

289661 is an equidigital number, since it uses as much as digits as its factorization.

289661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210.

The product of its digits is 5184, while the sum is 32.

The square root of 289661 is about 538.2016350774. The cubic root of 289661 is about 66.1652577352.

The spelling of 289661 in words is "two hundred eighty-nine thousand, six hundred sixty-one".