28232251 has 2 divisors, whose sum is σ = 28232252. Its totient is φ = 28232250.

The previous prime is 28232249. The next prime is 28232263. The reversal of 28232251 is 15223282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28232251 - 2¹ = 28232249 is a prime.

Together with 28232249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28232551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14116125 + 14116126.

It is an arithmetic number, because the mean of its divisors is an integer number (14116126).

Almost surely, 2^28232251 is an apocalyptic number.

28232251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28232251 is an equidigital number, since it uses as much as digits as its factorization.

28232251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 28232251 is about 5313.4029585568. The cubic root of 28232251 is about 304.4961707811.

The spelling of 28232251 in words is "twenty-eight million, two hundred thirty-two thousand, two hundred fifty-one".