217468513 has 6 divisors (see below), whose sum is σ = 221220434. Its totient is φ = 213779184.

The previous prime is 217468507. The next prime is 217468523. The reversal of 217468513 is 315864712.

It can be written as a sum of positive squares in only one way, i.e., 187361344 + 30107169 = 13688^2 + 5487^2 .

It is a de Polignac number, because none of the positive numbers 2^k-217468513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217468523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27756 + ... + 34717.

Almost surely, 2^217468513 is an apocalyptic number.

It is an amenable number.

217468513 is a deficient number, since it is larger than the sum of its proper divisors (3751921).

217468513 is an frugal number, since it uses more digits than its factorization.

217468513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62591 (or 62532 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 217468513 is about 14746.8136558377. The cubic root of 217468513 is about 601.3566643835.

The spelling of 217468513 in words is "two hundred seventeen million, four hundred sixty-eight thousand, five hundred thirteen".