217197009847 has 2 divisors, whose sum is σ = 217197009848. Its totient is φ = 217197009846.

The previous prime is 217197009833. The next prime is 217197009937. The reversal of 217197009847 is 748900791712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217197009847 - 2³⁵ = 182837271479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217197009947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108598504923 + 108598504924.

It is an arithmetic number, because the mean of its divisors is an integer number (108598504924).

Almost surely, 2^217197009847 is an apocalyptic number.

217197009847 is a deficient number, since it is larger than the sum of its proper divisors (1).

217197009847 is an equidigital number, since it uses as much as digits as its factorization.

217197009847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The spelling of 217197009847 in words is "two hundred seventeen billion, one hundred ninety-seven million, nine thousand, eight hundred forty-seven".