1282730321 has 4 divisors (see below), whose sum is σ = 1282802100. Its totient is φ = 1282658544.

The previous prime is 1282730219. The next prime is 1282730333. The reversal of 1282730321 is 1230372821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 770839696 + 511890625 = 27764^2 + 22625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1282730321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1282730381) 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, 14495 + ... + 52683.

It is an arithmetic number, because the mean of its divisors is an integer number (320700525).

Almost surely, 2^1282730321 is an apocalyptic number.

It is an amenable number.

1282730321 is a deficient number, since it is larger than the sum of its proper divisors (71779).

1282730321 is an equidigital number, since it uses as much as digits as its factorization.

1282730321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71778.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1282730321 is about 35815.2247096120. The cubic root of 1282730321 is about 1086.5385016500.

The spelling of 1282730321 in words is "one billion, two hundred eighty-two million, seven hundred thirty thousand, three hundred twenty-one".