549705921 has 8 divisors (see below), whose sum is σ = 733187424. Its totient is φ = 366347520.

The previous prime is 549705917. The next prime is 549705977. The reversal of 549705921 is 129507945.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 549705921 - 2² = 549705917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549705521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19795 + ... + 38616.

It is an arithmetic number, because the mean of its divisors is an integer number (91648428).

Almost surely, 2^549705921 is an apocalyptic number.

It is an amenable number.

549705921 is a deficient number, since it is larger than the sum of its proper divisors (183481503).

549705921 is a wasteful number, since it uses less digits than its factorization.

549705921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61551.

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 549705921 is about 23445.8081754500. The cubic root of 549705921 is about 819.1752171847.

The spelling of 549705921 in words is "five hundred forty-nine million, seven hundred five thousand, nine hundred twenty-one".