28317251 has 2 divisors, whose sum is σ = 28317252. Its totient is φ = 28317250.

The previous prime is 28317241. The next prime is 28317283. The reversal of 28317251 is 15271382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28317251 - 2⁶ = 28317187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28317221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14158625 + 14158626.

It is an arithmetic number, because the mean of its divisors is an integer number (14158626).

Almost surely, 2^28317251 is an apocalyptic number.

28317251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28317251 is an equidigital number, since it uses as much as digits as its factorization.

28317251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 28317251 is about 5321.3955876255. The cubic root of 28317251 is about 304.8014509969.

The spelling of 28317251 in words is "twenty-eight million, three hundred seventeen thousand, two hundred fifty-one".