217181413 has 2 divisors, whose sum is σ = 217181414. Its totient is φ = 217181412.

The previous prime is 217181399. The next prime is 217181441. The reversal of 217181413 is 314181712.

It is an a-pointer prime, because the next prime (217181441) can be obtained adding 217181413 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205119684 + 12061729 = 14322^2 + 3473^2 .

It is a cyclic number.

It is not a de Polignac number, because 217181413 - 2¹³ = 217173221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217181473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108590706 + 108590707.

It is an arithmetic number, because the mean of its divisors is an integer number (108590707).

Almost surely, 2^217181413 is an apocalyptic number.

It is an amenable number.

217181413 is a deficient number, since it is larger than the sum of its proper divisors (1).

217181413 is an equidigital number, since it uses as much as digits as its factorization.

217181413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 217181413 is about 14737.0761347019. The cubic root of 217181413 is about 601.0919125986.

The spelling of 217181413 in words is "two hundred seventeen million, one hundred eighty-one thousand, four hundred thirteen".