1311523 has 2 divisors, whose sum is σ = 1311524. Its totient is φ = 1311522.

The previous prime is 1311509. The next prime is 1311547. The reversal of 1311523 is 3251131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311523 - 2¹³ = 1303331 is a prime.

1311523 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1311497 and 1311506.

It is not a weakly prime, because it can be changed into another prime (1311503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655761 + 655762.

It is an arithmetic number, because the mean of its divisors is an integer number (655762).

2^1311523 is an apocalyptic number.

1311523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311523 is an equidigital number, since it uses as much as digits as its factorization.

1311523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 16.

The square root of 1311523 is about 1145.2174466013. The cubic root of 1311523 is about 109.4608048317.

Adding to 1311523 its reverse (3251131), we get a palindrome (4562654).

The spelling of 1311523 in words is "one million, three hundred eleven thousand, five hundred twenty-three".