1328388281 has 4 divisors (see below), whose sum is σ = 1449150864. Its totient is φ = 1207625700.

The previous prime is 1328388197. The next prime is 1328388283. The reversal of 1328388281 is 1828838231.

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 not a de Polignac number, because 1328388281 - 2²² = 1324193977 is a prime.

It is a super-2 number, since 2×1328388281² = 3529230850196269922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328388283) 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, 60381275 + ... + 60381296.

It is an arithmetic number, because the mean of its divisors is an integer number (362287716).

Almost surely, 2^1328388281 is an apocalyptic number.

1328388281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1328388281 is a deficient number, since it is larger than the sum of its proper divisors (120762583).

1328388281 is a wasteful number, since it uses less digits than its factorization.

1328388281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120762582.

The product of its digits is 147456, while the sum is 44.

The square root of 1328388281 is about 36447.0613493050. The cubic root of 1328388281 is about 1099.2800470735.

The spelling of 1328388281 in words is "one billion, three hundred twenty-eight million, three hundred eighty-eight thousand, two hundred eighty-one".