288661 has 2 divisors, whose sum is σ = 288662. Its totient is φ = 288660.

The previous prime is 288653. The next prime is 288679. The reversal of 288661 is 166882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 28561 = 510^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 288661 - 2³ = 288653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144330 + 144331.

It is an arithmetic number, because the mean of its divisors is an integer number (144331).

2²⁸⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

288661 is a deficient number, since it is larger than the sum of its proper divisors (1).

288661 is an equidigital number, since it uses as much as digits as its factorization.

288661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 288661 is about 537.2718120281. The cubic root of 288661 is about 66.0890289193.

It can be divided in two parts, 288 and 661, that added together give a palindrome (949).

The spelling of 288661 in words is "two hundred eighty-eight thousand, six hundred sixty-one".