1143221511 has 4 divisors (see below), whose sum is σ = 1524295352. Its totient is φ = 762147672.

The previous prime is 1143221489. The next prime is 1143221531. The reversal of 1143221511 is 1151223411.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1143221511 - 2²¹ = 1141124359 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 (1143221531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190536916 + ... + 190536921.

It is an arithmetic number, because the mean of its divisors is an integer number (381073838).

Almost surely, 2^1143221511 is an apocalyptic number.

1143221511 is a deficient number, since it is larger than the sum of its proper divisors (381073841).

1143221511 is an equidigital number, since it uses as much as digits as its factorization.

1143221511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381073840.

The product of its digits is 240, while the sum is 21.

The square root of 1143221511 is about 33811.5588371787. The cubic root of 1143221511 is about 1045.6270165454.

Adding to 1143221511 its reverse (1151223411), we get a palindrome (2294444922).

The spelling of 1143221511 in words is "one billion, one hundred forty-three million, two hundred twenty-one thousand, five hundred eleven".