1311013503 has 12 divisors (see below), whose sum is σ = 1894090848. Its totient is φ = 873822240.

The previous prime is 1311013493. The next prime is 1311013513. The reversal of 1311013503 is 3053101131.

1311013503 is a `hidden beast` number, since 1 + 311 + 0 + 1 + 350 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1311013493) and next prime (1311013513).

It is not a de Polignac number, because 1311013503 - 2¹⁴ = 1310997119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311013513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38938 + ... + 64328.

It is an arithmetic number, because the mean of its divisors is an integer number (157840904).

Almost surely, 2^1311013503 is an apocalyptic number.

1311013503 is a deficient number, since it is larger than the sum of its proper divisors (583077345).

1311013503 is a wasteful number, since it uses less digits than its factorization.

1311013503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31134 (or 31131 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 1311013503 is about 36207.9204456704. The cubic root of 1311013503 is about 1094.4662864742.

Adding to 1311013503 its reverse (3053101131), we get a palindrome (4364114634).

The spelling of 1311013503 in words is "one billion, three hundred eleven million, thirteen thousand, five hundred three".