28211291 has 2 divisors, whose sum is σ = 28211292. Its totient is φ = 28211290.

The previous prime is 28211237. The next prime is 28211303. The reversal of 28211291 is 19211282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28211291 - 2¹⁰ = 28210267 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28211291.

It is not a weakly prime, because it can be changed into another prime (28211201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105645 + 14105646.

It is an arithmetic number, because the mean of its divisors is an integer number (14105646).

Almost surely, 2^28211291 is an apocalyptic number.

28211291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211291 is an equidigital number, since it uses as much as digits as its factorization.

28211291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

The square root of 28211291 is about 5311.4302217011. The cubic root of 28211291 is about 304.4207981182.

Subtracting from 28211291 its reverse (19211282), we obtain a palindrome (9000009).

The spelling of 28211291 in words is "twenty-eight million, two hundred eleven thousand, two hundred ninety-one".