247904717 has 2 divisors, whose sum is σ = 247904718. Its totient is φ = 247904716.

The previous prime is 247904707. The next prime is 247904719. The reversal of 247904717 is 717409742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218625796 + 29278921 = 14786^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 247904717 - 2¹⁸ = 247642573 is a prime.

It is a super-2 number, since 2×247904717² = 122913497421700178, which contains 22 as substring.

Together with 247904719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247904719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123952358 + 123952359.

It is an arithmetic number, because the mean of its divisors is an integer number (123952359).

Almost surely, 2^247904717 is an apocalyptic number.

It is an amenable number.

247904717 is a deficient number, since it is larger than the sum of its proper divisors (1).

247904717 is an equidigital number, since it uses as much as digits as its factorization.

247904717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 247904717 is about 15744.9902191141. The cubic root of 247904717 is about 628.1956577594.

The spelling of 247904717 in words is "two hundred forty-seven million, nine hundred four thousand, seven hundred seventeen".