1311055303 has 4 divisors (see below), whose sum is σ = 1311605568. Its totient is φ = 1310505040.

The previous prime is 1311055259. The next prime is 1311055331. The reversal of 1311055303 is 3035501131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3035501131 = 13 ⋅233500087.

It is a cyclic number.

It is not a de Polignac number, because 1311055303 - 2²¹ = 1308958151 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 (1311055363) 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, 271543 + ... + 276328.

It is an arithmetic number, because the mean of its divisors is an integer number (327901392).

Almost surely, 2^1311055303 is an apocalyptic number.

1311055303 is a deficient number, since it is larger than the sum of its proper divisors (550265).

1311055303 is an equidigital number, since it uses as much as digits as its factorization.

1311055303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550264.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 1311055303 is about 36208.4976628415. The cubic root of 1311055303 is about 1094.4779182397.

Adding to 1311055303 its reverse (3035501131), we get a palindrome (4346556434).

The spelling of 1311055303 in words is "one billion, three hundred eleven million, fifty-five thousand, three hundred three".