217313265 has 16 divisors (see below), whose sum is σ = 374447808. Its totient is φ = 106984896.

The previous prime is 217313263. The next prime is 217313267. The reversal of 217313265 is 562313712.

It is an interprime number because it is at equal distance from previous prime (217313263) and next prime (217313267).

It is not a de Polignac number, because 217313265 - 2¹ = 217313263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217313263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557019 + ... + 557408.

It is an arithmetic number, because the mean of its divisors is an integer number (23402988).

Almost surely, 2^217313265 is an apocalyptic number.

It is an amenable number.

217313265 is a deficient number, since it is larger than the sum of its proper divisors (157134543).

217313265 is a wasteful number, since it uses less digits than its factorization.

217313265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114448.

The product of its digits is 7560, while the sum is 30.

The square root of 217313265 is about 14741.5489348983. The cubic root of 217313265 is about 601.2135300312.

Adding to 217313265 its reverse (562313712), we get a palindrome (779626977).

The spelling of 217313265 in words is "two hundred seventeen million, three hundred thirteen thousand, two hundred sixty-five".