550981729 has 3 divisors (see below), whose sum is σ = 551005203. Its totient is φ = 550958256.

The previous prime is 550981727. The next prime is 550981733. The reversal of 550981729 is 927189055.

The square root of 550981729 is 23473.

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., 544989025 + 5992704 = 23345^2 + 2448^2 .

It is not a de Polignac number, because 550981729 - 2¹ = 550981727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550981723) 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, 11737 + ... + 35209.

It is an arithmetic number, because the mean of its divisors is an integer number (183668401).

Almost surely, 2^550981729 is an apocalyptic number.

550981729 is the 23473-rd square number.

550981729 is the 11737-th centered octagonal number.

It is an amenable number.

550981729 is a deficient number, since it is larger than the sum of its proper divisors (23474).

550981729 is an frugal number, since it uses more digits than its factorization.

550981729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46946 (or 23473 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The cubic root of 550981729 is about 819.8084665684.

The spelling of 550981729 in words is "five hundred fifty million, nine hundred eighty-one thousand, seven hundred twenty-nine".