1230303521 has 2 divisors, whose sum is σ = 1230303522. Its totient is φ = 1230303520.

The previous prime is 1230303457. The next prime is 1230303589. The reversal of 1230303521 is 1253030321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055535121 + 174768400 = 32489^2 + 13220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230303521 - 2⁶ = 1230303457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1230303493 and 1230303502.

It is not a weakly prime, because it can be changed into another prime (1260303521) 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 as a sum of consecutive naturals, namely, 615151760 + 615151761.

It is an arithmetic number, because the mean of its divisors is an integer number (615151761).

Almost surely, 2^1230303521 is an apocalyptic number.

It is an amenable number.

1230303521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230303521 is an equidigital number, since it uses as much as digits as its factorization.

1230303521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1230303521 is about 35075.6827588573. The cubic root of 1230303521 is about 1071.5293938587.

Adding to 1230303521 its reverse (1253030321), we get a palindrome (2483333842).

The spelling of 1230303521 in words is "one billion, two hundred thirty million, three hundred three thousand, five hundred twenty-one".