217068949 has 2 divisors, whose sum is σ = 217068950. Its totient is φ = 217068948.

The previous prime is 217068947. The next prime is 217068959. The reversal of 217068949 is 949860712.

217068949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151167025 + 65901924 = 12295^2 + 8118^2 .

It is a cyclic number.

It is not a de Polignac number, because 217068949 - 2¹ = 217068947 is a prime.

Together with 217068947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 217068899 and 217068908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217068947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108534474 + 108534475.

It is an arithmetic number, because the mean of its divisors is an integer number (108534475).

Almost surely, 2^217068949 is an apocalyptic number.

It is an amenable number.

217068949 is a deficient number, since it is larger than the sum of its proper divisors (1).

217068949 is an equidigital number, since it uses as much as digits as its factorization.

217068949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 217068949 is about 14733.2599583392. The cubic root of 217068949 is about 600.9881393337.

The spelling of 217068949 in words is "two hundred seventeen million, sixty-eight thousand, nine hundred forty-nine".