217479093 has 16 divisors (see below), whose sum is σ = 314032320. Its totient is φ = 133081344.

The previous prime is 217479083. The next prime is 217479139. The reversal of 217479093 is 390974712.

It is not a de Polignac number, because 217479093 - 2⁴ = 217479077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217479023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8596 + ... + 22557.

It is an arithmetic number, because the mean of its divisors is an integer number (19627020).

Almost surely, 2^217479093 is an apocalyptic number.

It is an amenable number.

217479093 is a deficient number, since it is larger than the sum of its proper divisors (96553227).

217479093 is a wasteful number, since it uses less digits than its factorization.

217479093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31348.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 217479093 is about 14747.1723730348. The cubic root of 217479093 is about 601.3664163705.

The spelling of 217479093 in words is "two hundred seventeen million, four hundred seventy-nine thousand, ninety-three".