289145 has 4 divisors (see below), whose sum is σ = 346980. Its totient is φ = 231312.

The previous prime is 289141. The next prime is 289151. The reversal of 289145 is 541982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126736 + 162409 = 356^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 289145 - 2² = 289141 is a prime.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (289141) 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, 28910 + ... + 28919.

It is an arithmetic number, because the mean of its divisors is an integer number (86745).

2²⁸⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

289145 is a deficient number, since it is larger than the sum of its proper divisors (57835).

289145 is an equidigital number, since it uses as much as digits as its factorization.

289145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57834.

The product of its digits is 2880, while the sum is 29.

The square root of 289145 is about 537.7220471582. The cubic root of 289145 is about 66.1259456127.

It can be divided in two parts, 289 and 145, that multiplied together give a triangular number (41905 = T₂₈₉).

The spelling of 289145 in words is "two hundred eighty-nine thousand, one hundred forty-five".