217147193 has 8 divisors (see below), whose sum is σ = 223167336. Its totient is φ = 211161600.

The previous prime is 217147159. The next prime is 217147213. The reversal of 217147193 is 391741712.

It can be written as a sum of positive squares in 4 ways, for example, as 3636649 + 213510544 = 1907^2 + 14612^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 217147193 - 2¹⁰ = 217146169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217147493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4373 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (27895917).

Almost surely, 2^217147193 is an apocalyptic number.

It is an amenable number.

217147193 is a deficient number, since it is larger than the sum of its proper divisors (6020143).

217147193 is a wasteful number, since it uses less digits than its factorization.

217147193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17275.

The product of its digits is 10584, while the sum is 35.

The square root of 217147193 is about 14735.9150716879. The cubic root of 217147193 is about 601.0603407660.

The spelling of 217147193 in words is "two hundred seventeen million, one hundred forty-seven thousand, one hundred ninety-three".