549198921 has 8 divisors (see below), whose sum is σ = 744269824. Its totient is φ = 360130320.

The previous prime is 549198893. The next prime is 549198973. The reversal of 549198921 is 129891945.

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

It is not a de Polignac number, because 549198921 - 2¹⁰ = 549197897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (549198421) 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, 1500361 + ... + 1500726.

It is an arithmetic number, because the mean of its divisors is an integer number (93033728).

Almost surely, 2^549198921 is an apocalyptic number.

It is an amenable number.

549198921 is a deficient number, since it is larger than the sum of its proper divisors (195070903).

549198921 is a wasteful number, since it uses less digits than its factorization.

549198921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001151.

The product of its digits is 233280, while the sum is 48.

The square root of 549198921 is about 23434.9935139739. The cubic root of 549198921 is about 818.9232948568.

The spelling of 549198921 in words is "five hundred forty-nine million, one hundred ninety-eight thousand, nine hundred twenty-one".