1311331503 has 8 divisors (see below), whose sum is σ = 1748774016. Its totient is φ = 874055000.

The previous prime is 1311331501. The next prime is 1311331517. The reversal of 1311331503 is 3051331131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311331503 - 2¹ = 1311331501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311331503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311331501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21723 + ... + 55628.

It is an arithmetic number, because the mean of its divisors is an integer number (218596752).

Almost surely, 2^1311331503 is an apocalyptic number.

1311331503 is a deficient number, since it is larger than the sum of its proper divisors (437442513).

1311331503 is an equidigital number, since it uses as much as digits as its factorization.

1311331503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83005.

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

The square root of 1311331503 is about 36212.3114838034. The cubic root of 1311331503 is about 1094.5547707250.

Adding to 1311331503 its reverse (3051331131), we get a palindrome (4362662634).

The spelling of 1311331503 in words is "one billion, three hundred eleven million, three hundred thirty-one thousand, five hundred three".