471217721209 has 3 divisors (see below), whose sum is σ = 471218407663. Its totient is φ = 471217034756.

The previous prime is 471217721203. The next prime is 471217721213. The reversal of 471217721209 is 902127712174.

The square root of 471217721209 is 686453.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 109088181225 + 362129539984 = 330285^2 + 601772^2 .

It is not a de Polignac number, because 471217721209 - 2³ = 471217721201 is a prime.

It is a super-2 number, since 2×471217721209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (471217721201) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 343227 + ... + 1029679.

Almost surely, 2^471217721209 is an apocalyptic number.

471217721209 is the 686453-rd square number.

471217721209 is the 343227-th centered octagonal number.

It is an amenable number.

471217721209 is a deficient number, since it is larger than the sum of its proper divisors (686454).

471217721209 is an frugal number, since it uses more digits than its factorization.

471217721209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372906 (or 686453 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 43.

The spelling of 471217721209 in words is "four hundred seventy-one billion, two hundred seventeen million, seven hundred twenty-one thousand, two hundred nine".