1311005505 has 16 divisors (see below), whose sum is σ = 2098494720. Its totient is φ = 698907648.

The previous prime is 1311005503. The next prime is 1311005569. The reversal of 1311005505 is 5055001131.

It is not a de Polignac number, because 1311005505 - 2¹ = 1311005503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311005503) 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 15 ways as a sum of consecutive naturals, for example, 20961 + ... + 55329.

It is an arithmetic number, because the mean of its divisors is an integer number (131155920).

Almost surely, 2^1311005505 is an apocalyptic number.

1311005505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311005505 is a deficient number, since it is larger than the sum of its proper divisors (787489215).

1311005505 is a wasteful number, since it uses less digits than its factorization.

1311005505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36920.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 1311005505 is about 36207.8100000539. The cubic root of 1311005505 is about 1094.4640608274.

Adding to 1311005505 its reverse (5055001131), we get a palindrome (6366006636).

The spelling of 1311005505 in words is "one billion, three hundred eleven million, five thousand, five hundred five".