549983621 has 4 divisors (see below), whose sum is σ = 599982144. Its totient is φ = 499985100.

The previous prime is 549983593. The next prime is 549983627. The reversal of 549983621 is 126389945.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 549983621 - 2¹⁰ = 549982597 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 (549983627) 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, 24999245 + ... + 24999266.

It is an arithmetic number, because the mean of its divisors is an integer number (149995536).

Almost surely, 2^549983621 is an apocalyptic number.

It is an amenable number.

549983621 is a deficient number, since it is larger than the sum of its proper divisors (49998523).

549983621 is a wasteful number, since it uses less digits than its factorization.

549983621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49998522.

The product of its digits is 466560, while the sum is 47.

The square root of 549983621 is about 23451.7295950640. The cubic root of 549983621 is about 819.3131373908.

The spelling of 549983621 in words is "five hundred forty-nine million, nine hundred eighty-three thousand, six hundred twenty-one".