217125329 has 4 divisors (see below), whose sum is σ = 217440240. Its totient is φ = 216810420.

The previous prime is 217125281. The next prime is 217125347. The reversal of 217125329 is 923521712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 217125329 - 2¹⁶ = 217059793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217125295 and 217125304.

It is not an unprimeable number, because it can be changed into a prime (217125229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156419 + ... + 157800.

It is an arithmetic number, because the mean of its divisors is an integer number (54360060).

Almost surely, 2^217125329 is an apocalyptic number.

It is an amenable number.

217125329 is a deficient number, since it is larger than the sum of its proper divisors (314911).

217125329 is an equidigital number, since it uses as much as digits as its factorization.

217125329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314910.

The product of its digits is 7560, while the sum is 32.

The square root of 217125329 is about 14735.1731920599. The cubic root of 217125329 is about 601.0401670086.

The spelling of 217125329 in words is "two hundred seventeen million, one hundred twenty-five thousand, three hundred twenty-nine".