1311180823 has 4 divisors (see below), whose sum is σ = 1380190360. Its totient is φ = 1242171288.

The previous prime is 1311180809. The next prime is 1311180839. The reversal of 1311180823 is 3280811131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311180823 - 2⁵ = 1311180791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311180791 and 1311180800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311180853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34504740 + ... + 34504777.

It is an arithmetic number, because the mean of its divisors is an integer number (345047590).

Almost surely, 2^1311180823 is an apocalyptic number.

1311180823 is a deficient number, since it is larger than the sum of its proper divisors (69009537).

1311180823 is an equidigital number, since it uses as much as digits as its factorization.

1311180823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69009536.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1311180823 is about 36210.2309161375. The cubic root of 1311180823 is about 1094.5128454427.

Adding to 1311180823 its reverse (3280811131), we get a palindrome (4591991954).

The spelling of 1311180823 in words is "one billion, three hundred eleven million, one hundred eighty thousand, eight hundred twenty-three".