247798321 has 2 divisors, whose sum is σ = 247798322. Its totient is φ = 247798320.

The previous prime is 247798303. The next prime is 247798357. The reversal of 247798321 is 123897742.

247798321 = 105⁴ + 106⁴.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126247696 + 121550625 = 11236^2 + 11025^2 .

It is a cyclic number.

It is not a de Polignac number, because 247798321 - 2⁷ = 247798193 is a prime.

It is a super-2 number, since 2×247798321² = 122808015780838082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247798391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123899160 + 123899161.

It is an arithmetic number, because the mean of its divisors is an integer number (123899161).

Almost surely, 2^247798321 is an apocalyptic number.

It is an amenable number.

247798321 is a deficient number, since it is larger than the sum of its proper divisors (1).

247798321 is an equidigital number, since it uses as much as digits as its factorization.

247798321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 247798321 is about 15741.6111310120. The cubic root of 247798321 is about 628.1057750145.

The spelling of 247798321 in words is "two hundred forty-seven million, seven hundred ninety-eight thousand, three hundred twenty-one".