1311501603 has 4 divisors (see below), whose sum is σ = 1748668808. Its totient is φ = 874334400.

The previous prime is 1311501551. The next prime is 1311501623. The reversal of 1311501603 is 3061051131.

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

It is not a de Polignac number, because 1311501603 - 2¹⁸ = 1311239459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311501603.

It is not an unprimeable number, because it can be changed into a prime (1311501623) 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 3 ways as a sum of consecutive naturals, for example, 218583598 + ... + 218583603.

It is an arithmetic number, because the mean of its divisors is an integer number (437167202).

Almost surely, 2^1311501603 is an apocalyptic number.

1311501603 is a deficient number, since it is larger than the sum of its proper divisors (437167205).

1311501603 is an equidigital number, since it uses as much as digits as its factorization.

1311501603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437167204.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 1311501603 is about 36214.6600563915. The cubic root of 1311501603 is about 1094.6020955793.

Adding to 1311501603 its reverse (3061051131), we get a palindrome (4372552734).

The spelling of 1311501603 in words is "one billion, three hundred eleven million, five hundred one thousand, six hundred three".