1311135503 has 4 divisors (see below), whose sum is σ = 1316762928. Its totient is φ = 1305508080.

The previous prime is 1311135499. The next prime is 1311135533. The reversal of 1311135503 is 3055311131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311135503 - 2² = 1311135499 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 (1311135533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813363 + ... + 2813828.

It is an arithmetic number, because the mean of its divisors is an integer number (329190732).

Almost surely, 2^1311135503 is an apocalyptic number.

1311135503 is a deficient number, since it is larger than the sum of its proper divisors (5627425).

1311135503 is an equidigital number, since it uses as much as digits as its factorization.

1311135503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627424.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 1311135503 is about 36209.6051207411. The cubic root of 1311135503 is about 1094.5002349538.

Adding to 1311135503 its reverse (3055311131), we get a palindrome (4366446634).

The spelling of 1311135503 in words is "one billion, three hundred eleven million, one hundred thirty-five thousand, five hundred three".