1311011503 has 2 divisors, whose sum is σ = 1311011504. Its totient is φ = 1311011502.

The previous prime is 1311011479. The next prime is 1311011567. The reversal of 1311011503 is 3051101131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311011503 - 2⁹ = 1311010991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311011003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655505751 + 655505752.

It is an arithmetic number, because the mean of its divisors is an integer number (655505752).

Almost surely, 2^1311011503 is an apocalyptic number.

1311011503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311011503 is an equidigital number, since it uses as much as digits as its factorization.

1311011503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 1311011503 is about 36207.8928273933. The cubic root of 1311011503 is about 1094.4657299243.

Adding to 1311011503 its reverse (3051101131), we get a palindrome (4362112634).

The spelling of 1311011503 in words is "one billion, three hundred eleven million, eleven thousand, five hundred three".