1530455221 has 4 divisors (see below), whose sum is σ = 1556395200. Its totient is φ = 1504515244.

The previous prime is 1530455153. The next prime is 1530455231. The reversal of 1530455221 is 1225540351.

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 a de Polignac number, because none of the positive numbers 2^k-1530455221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1530455221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530455231) 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, 12969901 + ... + 12970018.

It is an arithmetic number, because the mean of its divisors is an integer number (389098800).

Almost surely, 2^1530455221 is an apocalyptic number.

It is an amenable number.

1530455221 is a deficient number, since it is larger than the sum of its proper divisors (25939979).

1530455221 is an equidigital number, since it uses as much as digits as its factorization.

1530455221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25939978.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1530455221 is about 39121.0329746033. The cubic root of 1530455221 is about 1152.4096220161.

Adding to 1530455221 its reverse (1225540351), we get a palindrome (2755995572).

The spelling of 1530455221 in words is "one billion, five hundred thirty million, four hundred fifty-five thousand, two hundred twenty-one".