1320405503 has 2 divisors, whose sum is σ = 1320405504. Its totient is φ = 1320405502.

The previous prime is 1320405497. The next prime is 1320405571. The reversal of 1320405503 is 3055040231.

It is a weak prime.

It is an emirp because it is prime and its reverse (3055040231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320405503 - 2¹⁸ = 1320143359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320405803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660202751 + 660202752.

It is an arithmetic number, because the mean of its divisors is an integer number (660202752).

Almost surely, 2^1320405503 is an apocalyptic number.

1320405503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320405503 is an equidigital number, since it uses as much as digits as its factorization.

1320405503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 1320405503 is about 36337.3843720211. The cubic root of 1320405503 is about 1097.0736275473.

Adding to 1320405503 its reverse (3055040231), we get a palindrome (4375445734).

The spelling of 1320405503 in words is "one billion, three hundred twenty million, four hundred five thousand, five hundred three".