538049221 has 4 divisors (see below), whose sum is σ = 538106272. Its totient is φ = 537992172.

The previous prime is 538049137. The next prime is 538049249. The reversal of 538049221 is 122940835.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122940835 = 5 ⋅24588167.

It is a cyclic number.

It is not a de Polignac number, because 538049221 - 2¹¹ = 538047173 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 (538049251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10641 + ... + 34486.

It is an arithmetic number, because the mean of its divisors is an integer number (134526568).

Almost surely, 2^538049221 is an apocalyptic number.

It is an amenable number.

538049221 is a deficient number, since it is larger than the sum of its proper divisors (57051).

538049221 is a wasteful number, since it uses less digits than its factorization.

538049221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57050.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 538049221 is about 23195.8880192158. Note that the first 3 decimals coincide. The cubic root of 538049221 is about 813.3435038405.

The spelling of 538049221 in words is "five hundred thirty-eight million, forty-nine thousand, two hundred twenty-one".