550721239 has 4 divisors (see below), whose sum is σ = 583116624. Its totient is φ = 518325856.

The previous prime is 550721161. The next prime is 550721261. The reversal of 550721239 is 932127055.

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

It is a cyclic number.

It is not a de Polignac number, because 550721239 - 2⁷ = 550721111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550721299) 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, 16197667 + ... + 16197700.

It is an arithmetic number, because the mean of its divisors is an integer number (145779156).

Almost surely, 2^550721239 is an apocalyptic number.

550721239 is a deficient number, since it is larger than the sum of its proper divisors (32395385).

550721239 is a wasteful number, since it uses less digits than its factorization.

550721239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32395384.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 550721239 is about 23467.4506284769. The cubic root of 550721239 is about 819.6792514124.

The spelling of 550721239 in words is "five hundred fifty million, seven hundred twenty-one thousand, two hundred thirty-nine".