1143533155 has 4 divisors (see below), whose sum is σ = 1372239792. Its totient is φ = 914826520.

The previous prime is 1143533071. The next prime is 1143533161. The reversal of 1143533155 is 5513353411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5513353411 = 401 ⋅13749011.

It is a de Polignac number, because none of the positive numbers 2^k-1143533155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114353311 + ... + 114353320.

It is an arithmetic number, because the mean of its divisors is an integer number (343059948).

Almost surely, 2^1143533155 is an apocalyptic number.

1143533155 is a deficient number, since it is larger than the sum of its proper divisors (228706637).

1143533155 is an equidigital number, since it uses as much as digits as its factorization.

1143533155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228706636.

The product of its digits is 13500, while the sum is 31.

The square root of 1143533155 is about 33816.1670654733. The cubic root of 1143533155 is about 1045.7220211084.

Adding to 1143533155 its reverse (5513353411), we get a palindrome (6656886566).

The spelling of 1143533155 in words is "one billion, one hundred forty-three million, five hundred thirty-three thousand, one hundred fifty-five".