217985341 has 4 divisors (see below), whose sum is σ = 249126112. Its totient is φ = 186844572.

The previous prime is 217985323. The next prime is 217985393. The reversal of 217985341 is 143589712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217985341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217985294 and 217985303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217985321) 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 in 3 ways as a sum of consecutive naturals, for example, 15570375 + ... + 15570388.

It is an arithmetic number, because the mean of its divisors is an integer number (62281528).

Almost surely, 2^217985341 is an apocalyptic number.

It is an amenable number.

217985341 is a deficient number, since it is larger than the sum of its proper divisors (31140771).

217985341 is an equidigital number, since it uses as much as digits as its factorization.

217985341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31140770.

The product of its digits is 60480, while the sum is 40.

The square root of 217985341 is about 14764.3266355090. The cubic root of 217985341 is about 601.8326751738.

The spelling of 217985341 in words is "two hundred seventeen million, nine hundred eighty-five thousand, three hundred forty-one".