1143211555 has 8 divisors (see below), whose sum is σ = 1373040432. Its totient is φ = 913778208.

The previous prime is 1143211493. The next prime is 1143211561. The reversal of 1143211555 is 5551123411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1143211555 - 2¹³ = 1143203363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92484 + ... + 104113.

It is an arithmetic number, because the mean of its divisors is an integer number (171630054).

Almost surely, 2^1143211555 is an apocalyptic number.

1143211555 is a deficient number, since it is larger than the sum of its proper divisors (229828877).

1143211555 is a wasteful number, since it uses less digits than its factorization.

1143211555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197765.

The product of its digits is 3000, while the sum is 28.

The square root of 1143211555 is about 33811.4116091003. The cubic root of 1143211555 is about 1045.6239811778.

Adding to 1143211555 its reverse (5551123411), we get a palindrome (6694334966).

The spelling of 1143211555 in words is "one billion, one hundred forty-three million, two hundred eleven thousand, five hundred fifty-five".