217713047 has 2 divisors, whose sum is σ = 217713048. Its totient is φ = 217713046.

The previous prime is 217712983. The next prime is 217713053. The reversal of 217713047 is 740317712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217713047 - 2⁶ = 217712983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217713247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108856523 + 108856524.

It is an arithmetic number, because the mean of its divisors is an integer number (108856524).

Almost surely, 2^217713047 is an apocalyptic number.

217713047 is a deficient number, since it is larger than the sum of its proper divisors (1).

217713047 is an equidigital number, since it uses as much as digits as its factorization.

217713047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 217713047 is about 14755.1024056087. The cubic root of 217713047 is about 601.5819798633.

The spelling of 217713047 in words is "two hundred seventeen million, seven hundred thirteen thousand, forty-seven".