1311245523 has 32 divisors (see below), whose sum is σ = 2225387520. Its totient is φ = 747498240.

The previous prime is 1311245521. The next prime is 1311245609. The reversal of 1311245523 is 3255421131.

1311245523 is a `hidden beast` number, since 13 + 1 + 124 + 5 + 523 = 666.

It is not a de Polignac number, because 1311245523 - 2¹ = 1311245521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1311245521) 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, 73411 + ... + 89507.

It is an arithmetic number, because the mean of its divisors is an integer number (69543360).

Almost surely, 2^1311245523 is an apocalyptic number.

1311245523 is a deficient number, since it is larger than the sum of its proper divisors (914141997).

1311245523 is a wasteful number, since it uses less digits than its factorization.

1311245523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16544 (or 16538 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1311245523 is about 36211.1242990327. The cubic root of 1311245523 is about 1094.5308479981.

Adding to 1311245523 its reverse (3255421131), we get a palindrome (4566666654).

The spelling of 1311245523 in words is "one billion, three hundred eleven million, two hundred forty-five thousand, five hundred twenty-three".