1311442505 has 4 divisors (see below), whose sum is σ = 1573731012. Its totient is φ = 1049154000.

The previous prime is 1311442471. The next prime is 1311442511. The reversal of 1311442505 is 5052441131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 158432569 + 1153009936 = 12587^2 + 33956^2 .

It is not a de Polignac number, because 1311442505 - 2¹² = 1311438409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 131144246 + ... + 131144255.

It is an arithmetic number, because the mean of its divisors is an integer number (393432753).

Almost surely, 2^1311442505 is an apocalyptic number.

It is an amenable number.

1311442505 is a deficient number, since it is larger than the sum of its proper divisors (262288507).

1311442505 is an equidigital number, since it uses as much as digits as its factorization.

1311442505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262288506.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1311442505 is about 36213.8441069158. The cubic root of 1311442505 is about 1094.5856539254.

Adding to 1311442505 its reverse (5052441131), we get a palindrome (6363883636).

The spelling of 1311442505 in words is "one billion, three hundred eleven million, four hundred forty-two thousand, five hundred five".