1328261003 has 4 divisors (see below), whose sum is σ = 1333961928. Its totient is φ = 1322560080.

The previous prime is 1328260993. The next prime is 1328261047. The reversal of 1328261003 is 3001628231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1328261003 - 2²⁰ = 1327212427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328261093) 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, 2850113 + ... + 2850578.

It is an arithmetic number, because the mean of its divisors is an integer number (333490482).

Almost surely, 2^1328261003 is an apocalyptic number.

1328261003 is a deficient number, since it is larger than the sum of its proper divisors (5700925).

1328261003 is an equidigital number, since it uses as much as digits as its factorization.

1328261003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700924.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1328261003 is about 36445.3152407823. The cubic root of 1328261003 is about 1099.2449371997.

Adding to 1328261003 its reverse (3001628231), we get a palindrome (4329889234).

The spelling of 1328261003 in words is "one billion, three hundred twenty-eight million, two hundred sixty-one thousand, three".