1311243415 has 4 divisors (see below), whose sum is σ = 1573492104. Its totient is φ = 1048994728.

The previous prime is 1311243413. The next prime is 1311243431. The reversal of 1311243415 is 5143421131.

1311243415 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 1311243415 - 2¹ = 1311243413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311243415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311243413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131124337 + ... + 131124346.

It is an arithmetic number, because the mean of its divisors is an integer number (393373026).

Almost surely, 2^1311243415 is an apocalyptic number.

1311243415 is a deficient number, since it is larger than the sum of its proper divisors (262248689).

1311243415 is an equidigital number, since it uses as much as digits as its factorization.

1311243415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262248688.

The product of its digits is 1440, while the sum is 25.

The square root of 1311243415 is about 36211.0951919436. The cubic root of 1311243415 is about 1094.5302614636.

Adding to 1311243415 its reverse (5143421131), we get a palindrome (6454664546).

The spelling of 1311243415 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, four hundred fifteen".