217448985 has 32 divisors (see below), whose sum is σ = 376225920. Its totient is φ = 106610688.

The previous prime is 217448981. The next prime is 217449017. The reversal of 217448985 is 589844712.

It is a happy number.

It is not a de Polignac number, because 217448985 - 2² = 217448981 is a prime.

It is a super-2 number, since 2×217448985² = 94568122155060450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217448981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47946 + ... + 52284.

It is an arithmetic number, because the mean of its divisors is an integer number (11757060).

Almost surely, 2^217448985 is an apocalyptic number.

It is an amenable number.

217448985 is a deficient number, since it is larger than the sum of its proper divisors (158776935).

217448985 is a wasteful number, since it uses less digits than its factorization.

217448985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4617.

The product of its digits is 645120, while the sum is 48.

The square root of 217448985 is about 14746.1515318404. The cubic root of 217448985 is about 601.3386638550.

The spelling of 217448985 in words is "two hundred seventeen million, four hundred forty-eight thousand, nine hundred eighty-five".