1331520503 has 2 divisors, whose sum is σ = 1331520504. Its totient is φ = 1331520502.

The previous prime is 1331520497. The next prime is 1331520521. The reversal of 1331520503 is 3050251331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331520503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331520583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665760251 + 665760252.

It is an arithmetic number, because the mean of its divisors is an integer number (665760252).

Almost surely, 2^1331520503 is an apocalyptic number.

1331520503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331520503 is an equidigital number, since it uses as much as digits as its factorization.

1331520503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 1331520503 is about 36490.0055220604. The cubic root of 1331520503 is about 1100.1433705689.

Adding to 1331520503 its reverse (3050251331), we get a palindrome (4381771834).

The spelling of 1331520503 in words is "one billion, three hundred thirty-one million, five hundred twenty thousand, five hundred three".