289081 has 8 divisors (see below), whose sum is σ = 320264. Its totient is φ = 259200.

The previous prime is 289067. The next prime is 289099. The reversal of 289081 is 180982.

It is the 220-th star number.

It can be written as a sum of positive squares in 4 ways, for example, as 95481 + 193600 = 309^2 + 440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(289081) divides (289081-1)³.

It is a cyclic number.

It is not a de Polignac number, because 289081 - 2⁵ = 289049 is a prime.

It is a super-2 number, since 2×289081² = 167135649122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289001) 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, 181 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (40033).

2²⁸⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

289081 is a deficient number, since it is larger than the sum of its proper divisors (31183).

289081 is a wasteful number, since it uses less digits than its factorization.

289081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 289081 is about 537.6625335654. The cubic root of 289081 is about 66.1210664312.

The spelling of 289081 in words is "two hundred eighty-nine thousand, eighty-one".