1143311355 has 96 divisors (see below), whose sum is σ = 2118916800. Its totient is φ = 591224832.

The previous prime is 1143311333. The next prime is 1143311357. The reversal of 1143311355 is 5531133411.

It is a happy number.

1143311355 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1143311355 - 2⁶ = 1143311291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1143311357) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10489041 + ... + 10489149.

It is an arithmetic number, because the mean of its divisors is an integer number (22072050).

Almost surely, 2^1143311355 is an apocalyptic number.

1143311355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1143311355 is a deficient number, since it is larger than the sum of its proper divisors (975605445).

1143311355 is an equidigital number, since it uses as much as digits as its factorization.

1143311355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 303 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1143311355 is about 33812.8874099802. The cubic root of 1143311355 is about 1045.6544072281.

Adding to 1143311355 its reverse (5531133411), we get a palindrome (6674444766).

The spelling of 1143311355 in words is "one billion, one hundred forty-three million, three hundred eleven thousand, three hundred fifty-five".