28171291 has 2 divisors, whose sum is σ = 28171292. Its totient is φ = 28171290.

The previous prime is 28171277. The next prime is 28171301. The reversal of 28171291 is 19217182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28171291 - 2¹¹ = 28169243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28171201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14085645 + 14085646.

It is an arithmetic number, because the mean of its divisors is an integer number (14085646).

Almost surely, 2^28171291 is an apocalyptic number.

28171291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171291 is an equidigital number, since it uses as much as digits as its factorization.

28171291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The square root of 28171291 is about 5307.6634218835. The cubic root of 28171291 is about 304.2768534883.

The spelling of 28171291 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred ninety-one".