549724709 has 4 divisors (see below), whose sum is σ = 551109804. Its totient is φ = 548339616.

The previous prime is 549724673. The next prime is 549724723. The reversal of 549724709 is 907427945.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 464531809 + 85192900 = 21553^2 + 9230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549724709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549724729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691952 + ... + 692745.

It is an arithmetic number, because the mean of its divisors is an integer number (137777451).

Almost surely, 2^549724709 is an apocalyptic number.

It is an amenable number.

549724709 is a deficient number, since it is larger than the sum of its proper divisors (1385095).

549724709 is a wasteful number, since it uses less digits than its factorization.

549724709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385094.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 549724709 is about 23446.2088406633. The cubic root of 549724709 is about 819.1845497436.

The spelling of 549724709 in words is "five hundred forty-nine million, seven hundred twenty-four thousand, seven hundred nine".