28331249 has 2 divisors, whose sum is σ = 28331250. Its totient is φ = 28331248.

The previous prime is 28331209. The next prime is 28331273. The reversal of 28331249 is 94213382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 3010225 = 5032^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28331249 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28331209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14165624 + 14165625.

It is an arithmetic number, because the mean of its divisors is an integer number (14165625).

Almost surely, 2^28331249 is an apocalyptic number.

It is an amenable number.

28331249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28331249 is an equidigital number, since it uses as much as digits as its factorization.

28331249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 28331249 is about 5322.7106815982. The cubic root of 28331249 is about 304.8516666513.

The spelling of 28331249 in words is "twenty-eight million, three hundred thirty-one thousand, two hundred forty-nine".