217145193 has 32 divisors (see below), whose sum is σ = 307307520. Its totient is φ = 136221120.

The previous prime is 217145189. The next prime is 217145197. The reversal of 217145193 is 391541712.

It is an interprime number because it is at equal distance from previous prime (217145189) and next prime (217145197).

It is not a de Polignac number, because 217145193 - 2² = 217145189 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217145197) 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 31 ways as a sum of consecutive naturals, for example, 464746 + ... + 465212.

It is an arithmetic number, because the mean of its divisors is an integer number (9603360).

Almost surely, 2^217145193 is an apocalyptic number.

It is an amenable number.

217145193 is a deficient number, since it is larger than the sum of its proper divisors (90162327).

217145193 is a wasteful number, since it uses less digits than its factorization.

217145193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637.

The product of its digits is 7560, while the sum is 33.

The square root of 217145193 is about 14735.8472101200. The cubic root of 217145193 is about 601.0584954365.

The spelling of 217145193 in words is "two hundred seventeen million, one hundred forty-five thousand, one hundred ninety-three".