1311523545 has 32 divisors (see below), whose sum is σ = 2210947200. Its totient is φ = 662045184.

The previous prime is 1311523529. The next prime is 1311523547. The reversal of 1311523545 is 5453251131.

It is not a de Polignac number, because 1311523545 - 2⁴ = 1311523529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311523547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566851 + ... + 569159.

It is an arithmetic number, because the mean of its divisors is an integer number (69092100).

Almost surely, 2^1311523545 is an apocalyptic number.

1311523545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311523545 is a deficient number, since it is larger than the sum of its proper divisors (899423655).

1311523545 is a wasteful number, since it uses less digits than its factorization.

1311523545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329.

The product of its digits is 9000, while the sum is 30.

The square root of 1311523545 is about 36214.9629987385. The cubic root of 1311523545 is about 1094.6081999371.

Adding to 1311523545 its reverse (5453251131), we get a palindrome (6764774676).

The spelling of 1311523545 in words is "one billion, three hundred eleven million, five hundred twenty-three thousand, five hundred forty-five".