217460870929 has 9 divisors (see below), whose sum is σ = 231013568251. Its totient is φ = 204661593760.

The previous prime is 217460870923. The next prime is 217460871007. The reversal of 217460870929 is 929078064712.

The square root of 217460870929 is 466327.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 169303446225 + 48157424704 = 411465^2 + 219448^2 .

It is not a de Polignac number, because 217460870929 - 2²⁵ = 217427316497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217460870929.

It is not an unprimeable number, because it can be changed into a prime (217460870923) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7913844 + ... + 7941274.

Almost surely, 2^217460870929 is an apocalyptic number.

217460870929 is the 466327-th square number.

217460870929 is the 233164-th centered octagonal number.

It is an amenable number.

217460870929 is a deficient number, since it is larger than the sum of its proper divisors (13552697322).

217460870929 is an frugal number, since it uses more digits than its factorization.

217460870929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54896 (or 27448 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 217460870929 in words is "two hundred seventeen billion, four hundred sixty million, eight hundred seventy thousand, nine hundred twenty-nine".