1328223281 has 16 divisors (see below), whose sum is σ = 1684039680. Its totient is φ = 1017433680.

The previous prime is 1328223271. The next prime is 1328223283. The reversal of 1328223281 is 1823228231.

It is a cyclic number.

It is not a de Polignac number, because 1328223281 - 2⁶ = 1328223217 is a prime.

It is a super-2 number, since 2×1328223281² = 3528354168380809922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328223283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141641 + ... + 150726.

It is an arithmetic number, because the mean of its divisors is an integer number (105252480).

Almost surely, 2^1328223281 is an apocalyptic number.

1328223281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1328223281 is a deficient number, since it is larger than the sum of its proper divisors (355816399).

1328223281 is a wasteful number, since it uses less digits than its factorization.

1328223281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292444.

The product of its digits is 9216, while the sum is 32.

The square root of 1328223281 is about 36444.7977220343. The cubic root of 1328223281 is about 1099.2345310848.

It can be divided in two parts, 13282 and 23281, that added together give a palindrome (36563).

The spelling of 1328223281 in words is "one billion, three hundred twenty-eight million, two hundred twenty-three thousand, two hundred eighty-one".