217323413 has 2 divisors, whose sum is σ = 217323414. Its totient is φ = 217323412.

The previous prime is 217323401. The next prime is 217323439. The reversal of 217323413 is 314323712.

It is an a-pointer prime, because the next prime (217323439) can be obtained adding 217323413 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138344644 + 78978769 = 11762^2 + 8887^2 .

It is a cyclic number.

It is not a de Polignac number, because 217323413 - 2⁸ = 217323157 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 (217323443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108661706 + 108661707.

It is an arithmetic number, because the mean of its divisors is an integer number (108661707).

Almost surely, 2^217323413 is an apocalyptic number.

It is an amenable number.

217323413 is a deficient number, since it is larger than the sum of its proper divisors (1).

217323413 is an equidigital number, since it uses as much as digits as its factorization.

217323413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 26.

The square root of 217323413 is about 14741.8931280891. The cubic root of 217323413 is about 601.2228882878. Note that the first 3 decimals are identical.

The spelling of 217323413 in words is "two hundred seventeen million, three hundred twenty-three thousand, four hundred thirteen".