217225091 has 8 divisors (see below), whose sum is σ = 224592768. Its totient is φ = 209880000.

The previous prime is 217225067. The next prime is 217225147. The reversal of 217225091 is 190522712.

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 217225091 - 2¹⁸ = 216962947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217225061) 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, 15191 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (28074096).

Almost surely, 2^217225091 is an apocalyptic number.

217225091 is a deficient number, since it is larger than the sum of its proper divisors (7367677).

217225091 is a wasteful number, since it uses less digits than its factorization.

217225091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11293.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 217225091 is about 14738.5579688109. The cubic root of 217225091 is about 601.1322056918.

The spelling of 217225091 in words is "two hundred seventeen million, two hundred twenty-five thousand, ninety-one".