28155271 has 2 divisors, whose sum is σ = 28155272. Its totient is φ = 28155270.

The previous prime is 28155269. The next prime is 28155299. The reversal of 28155271 is 17255182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28155271 - 2¹ = 28155269 is a prime.

Together with 28155269, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14077635 + 14077636.

It is an arithmetic number, because the mean of its divisors is an integer number (14077636).

Almost surely, 2^28155271 is an apocalyptic number.

28155271 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155271 is an equidigital number, since it uses as much as digits as its factorization.

28155271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 31.

The square root of 28155271 is about 5306.1540686264. The cubic root of 28155271 is about 304.2191654509.

The spelling of 28155271 in words is "twenty-eight million, one hundred fifty-five thousand, two hundred seventy-one".