217250713 has 2 divisors, whose sum is σ = 217250714. Its totient is φ = 217250712.

The previous prime is 217250659. The next prime is 217250741. The reversal of 217250713 is 317052712.

It is an a-pointer prime, because the next prime (217250741) can be obtained adding 217250713 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214681104 + 2569609 = 14652^2 + 1603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217250713 is a prime.

It is not a weakly prime, because it can be changed into another prime (217250743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108625356 + 108625357.

It is an arithmetic number, because the mean of its divisors is an integer number (108625357).

Almost surely, 2^217250713 is an apocalyptic number.

It is an amenable number.

217250713 is a deficient number, since it is larger than the sum of its proper divisors (1).

217250713 is an equidigital number, since it uses as much as digits as its factorization.

217250713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 217250713 is about 14739.4271598322. The cubic root of 217250713 is about 601.1558395544.

The spelling of 217250713 in words is "two hundred seventeen million, two hundred fifty thousand, seven hundred thirteen".