217934193 has 8 divisors (see below), whose sum is σ = 291442528. Its totient is φ = 144857664.

The previous prime is 217934077. The next prime is 217934207. The reversal of 217934193 is 391439712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-217934193 is a prime.

It is a super-2 number, since 2×217934193² = 94990624957122498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217934593) 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 7 ways as a sum of consecutive naturals, for example, 106771 + ... + 108792.

It is an arithmetic number, because the mean of its divisors is an integer number (36430316).

Almost surely, 2^217934193 is an apocalyptic number.

It is an amenable number.

217934193 is a deficient number, since it is larger than the sum of its proper divisors (73508335).

217934193 is a wasteful number, since it uses less digits than its factorization.

217934193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215903.

The product of its digits is 40824, while the sum is 39.

The square root of 217934193 is about 14762.5943858117. The cubic root of 217934193 is about 601.7856002261.

The spelling of 217934193 in words is "two hundred seventeen million, nine hundred thirty-four thousand, one hundred ninety-three".