1311220133 has 6 divisors (see below), whose sum is σ = 1370708934. Its totient is φ = 1254210056.

The previous prime is 1311220129. The next prime is 1311220151. The reversal of 1311220133 is 3310221131.

It can be written as a sum of positive squares in only one way, i.e., 729108004 + 582112129 = 27002^2 + 24127^2 .

It is not a de Polignac number, because 1311220133 - 2² = 1311220129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311220103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1238810 + ... + 1239867.

It is an arithmetic number, because the mean of its divisors is an integer number (228451489).

Almost surely, 2^1311220133 is an apocalyptic number.

It is an amenable number.

1311220133 is a deficient number, since it is larger than the sum of its proper divisors (59488801).

1311220133 is an equidigital number, since it uses as much as digits as its factorization.

1311220133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478723 (or 2478700 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1311220133 is about 36210.7737144624. The cubic root of 1311220133 is about 1094.5237833874.

Adding to 1311220133 its reverse (3310221131), we get a palindrome (4621441264).

The spelling of 1311220133 in words is "one billion, three hundred eleven million, two hundred twenty thousand, one hundred thirty-three".