1320636503 has 8 divisors (see below), whose sum is σ = 1367214528. Its totient is φ = 1274828544.

The previous prime is 1320636497. The next prime is 1320636521. The reversal of 1320636503 is 3056360231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320636503 - 2¹⁸ = 1320374359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320636533) 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 7 ways as a sum of consecutive naturals, for example, 189026 + ... + 195887.

It is an arithmetic number, because the mean of its divisors is an integer number (170901816).

Almost surely, 2^1320636503 is an apocalyptic number.

1320636503 is a deficient number, since it is larger than the sum of its proper divisors (46578025).

1320636503 is an equidigital number, since it uses as much as digits as its factorization.

1320636503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385033.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 1320636503 is about 36340.5627777006. The cubic root of 1320636503 is about 1097.1376001249.

Adding to 1320636503 its reverse (3056360231), we get a palindrome (4376996734).

The spelling of 1320636503 in words is "one billion, three hundred twenty million, six hundred thirty-six thousand, five hundred three".