1538053221 has 4 divisors (see below), whose sum is σ = 2050737632. Its totient is φ = 1025368812.

The previous prime is 1538053177. The next prime is 1538053267. The reversal of 1538053221 is 1223508351.

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 not a de Polignac number, because 1538053221 - 2⁶ = 1538053157 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 (1538052221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256342201 + ... + 256342206.

It is an arithmetic number, because the mean of its divisors is an integer number (512684408).

Almost surely, 2^1538053221 is an apocalyptic number.

It is an amenable number.

1538053221 is a deficient number, since it is larger than the sum of its proper divisors (512684411).

1538053221 is an equidigital number, since it uses as much as digits as its factorization.

1538053221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512684410.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1538053221 is about 39218.0216354675. The cubic root of 1538053221 is about 1154.3135344776.

The spelling of 1538053221 in words is "one billion, five hundred thirty-eight million, fifty-three thousand, two hundred twenty-one".