1311220767 has 4 divisors (see below), whose sum is σ = 1748294360. Its totient is φ = 874147176.

The previous prime is 1311220759. The next prime is 1311220793. The reversal of 1311220767 is 7670221131.

1311220767 is digitally balanced in base 4, 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 not a de Polignac number, because 1311220767 - 2³ = 1311220759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311220747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218536792 + ... + 218536797.

It is an arithmetic number, because the mean of its divisors is an integer number (437073590).

Almost surely, 2^1311220767 is an apocalyptic number.

1311220767 is a deficient number, since it is larger than the sum of its proper divisors (437073593).

1311220767 is an equidigital number, since it uses as much as digits as its factorization.

1311220767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437073592.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1311220767 is about 36210.7824687620. The cubic root of 1311220767 is about 1094.5239597951.

Adding to 1311220767 its reverse (7670221131), we get a palindrome (8981441898).

The spelling of 1311220767 in words is "one billion, three hundred eleven million, two hundred twenty thousand, seven hundred sixty-seven".