217087093 has 4 divisors (see below), whose sum is σ = 229856940. Its totient is φ = 204317248.

The previous prime is 217087033. The next prime is 217087151. The reversal of 217087093 is 390780712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93276964 + 123810129 = 9658^2 + 11127^2 .

It is a cyclic number.

It is not a de Polignac number, because 217087093 - 2¹⁷ = 216956021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217087033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6384898 + ... + 6384931.

It is an arithmetic number, because the mean of its divisors is an integer number (57464235).

Almost surely, 2^217087093 is an apocalyptic number.

It is an amenable number.

217087093 is a deficient number, since it is larger than the sum of its proper divisors (12769847).

217087093 is a wasteful number, since it uses less digits than its factorization.

217087093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769846.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 217087093 is about 14733.8756951455. The cubic root of 217087093 is about 601.0048836677.

The spelling of 217087093 in words is "two hundred seventeen million, eighty-seven thousand, ninety-three".