28961 has 2 divisors, whose sum is σ = 28962. Its totient is φ = 28960.

The previous prime is 28949. The next prime is 28979. The reversal of 28961 is 16982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28561 + 400 = 169^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961 - 2¹⁴ = 12577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 28961.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28961.

It is not a weakly prime, because it can be changed into another prime (28901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480 + 14481.

It is an arithmetic number, because the mean of its divisors is an integer number (14481).

2²⁸⁹⁶¹ is an apocalyptic number.

It is an amenable number.

28961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961 is an equidigital number, since it uses as much as digits as its factorization.

28961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 28961 is about 170.1793171922. The cubic root of 28961 is about 30.7093896236.

It can be divided in two parts, 28 and 961, that added together give a palindrome (989).

The spelling of 28961 in words is "twenty-eight thousand, nine hundred sixty-one".