1020530321 has 4 divisors (see below), whose sum is σ = 1023854832. Its totient is φ = 1017205812.

The previous prime is 1020530311. The next prime is 1020530347. The reversal of 1020530321 is 1230350201.

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-1020530321 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 1020530321.

It is not an unprimeable number, because it can be changed into a prime (1020530311) 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, 1661795 + ... + 1662408.

It is an arithmetic number, because the mean of its divisors is an integer number (255963708).

Almost surely, 2^1020530321 is an apocalyptic number.

It is an amenable number.

1020530321 is a deficient number, since it is larger than the sum of its proper divisors (3324511).

1020530321 is an equidigital number, since it uses as much as digits as its factorization.

1020530321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324510.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1020530321 is about 31945.7402637660. The cubic root of 1020530321 is about 1006.7971346161.

Adding to 1020530321 its reverse (1230350201), we get a palindrome (2250880522).

The spelling of 1020530321 in words is "one billion, twenty million, five hundred thirty thousand, three hundred twenty-one".