11503131303 has 16 divisors (see below), whose sum is σ = 15786291200. Its totient is φ = 7447546080.

The previous prime is 11503131287. The next prime is 11503131307. The reversal of 11503131303 is 30313130511.

It is not a de Polignac number, because 11503131303 - 2⁴ = 11503131287 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 11503131303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503131307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383383 + ... + 412296.

It is an arithmetic number, because the mean of its divisors is an integer number (986643200).

Almost surely, 2^11503131303 is an apocalyptic number.

11503131303 is a deficient number, since it is larger than the sum of its proper divisors (4283159897).

11503131303 is an equidigital number, since it uses as much as digits as its factorization.

11503131303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795822.

The product of its (nonzero) digits is 405, while the sum is 21.

Adding to 11503131303 its reverse (30313130511), we get a palindrome (41816261814).

The spelling of 11503131303 in words is "eleven billion, five hundred three million, one hundred thirty-one thousand, three hundred three".