1328238181 has 2 divisors, whose sum is σ = 1328238182. Its totient is φ = 1328238180.

The previous prime is 1328238167. The next prime is 1328238209. The reversal of 1328238181 is 1818328231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665175681 + 663062500 = 25791^2 + 25750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328238181 is a prime.

It is a super-2 number, since 2×1328238181² = 3528433330932377522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1328238181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328238151) 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 as a sum of consecutive naturals, namely, 664119090 + 664119091.

It is an arithmetic number, because the mean of its divisors is an integer number (664119091).

Almost surely, 2^1328238181 is an apocalyptic number.

It is an amenable number.

1328238181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328238181 is an equidigital number, since it uses as much as digits as its factorization.

1328238181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 1328238181 is about 36445.0021402112. The cubic root of 1328238181 is about 1099.2386414713.

The spelling of 1328238181 in words is "one billion, three hundred twenty-eight million, two hundred thirty-eight thousand, one hundred eighty-one".