1328578243 has 2 divisors, whose sum is σ = 1328578244. Its totient is φ = 1328578242.

The previous prime is 1328578217. The next prime is 1328578283. The reversal of 1328578243 is 3428758231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1328578243 - 2¹⁷ = 1328447171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1328578243.

It is not a weakly prime, because it can be changed into another prime (1328578213) 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, 664289121 + 664289122.

It is an arithmetic number, because the mean of its divisors is an integer number (664289122).

Almost surely, 2^1328578243 is an apocalyptic number.

1328578243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328578243 is an equidigital number, since it uses as much as digits as its factorization.

1328578243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

The square root of 1328578243 is about 36449.6672549970. The cubic root of 1328578243 is about 1099.3324442745.

The spelling of 1328578243 in words is "one billion, three hundred twenty-eight million, five hundred seventy-eight thousand, two hundred forty-three".