28310251 has 2 divisors, whose sum is σ = 28310252. Its totient is φ = 28310250.

The previous prime is 28310201. The next prime is 28310257. The reversal of 28310251 is 15201382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28310251 - 2⁷ = 28310123 is a prime.

It is not a weakly prime, because it can be changed into another prime (28310257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155125 + 14155126.

It is an arithmetic number, because the mean of its divisors is an integer number (14155126).

Almost surely, 2^28310251 is an apocalyptic number.

28310251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28310251 is an equidigital number, since it uses as much as digits as its factorization.

28310251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 28310251 is about 5320.7378247758. The cubic root of 28310251 is about 304.7763333753.

It can be divided in two parts, 28310 and 251, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28310251 in words is "twenty-eight million, three hundred ten thousand, two hundred fifty-one".