1161322143 has 8 divisors (see below), whose sum is σ = 1548781056. Its totient is φ = 774039000.

The previous prime is 1161322133. The next prime is 1161322147. The reversal of 1161322143 is 3412231611.

It is a happy number.

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

It is not a de Polignac number, because 1161322143 - 2²¹ = 1159224991 is a prime.

It is a super-2 number, since 2×1161322143² = 2697338239644224898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161322147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27663 + ... + 55568.

It is an arithmetic number, because the mean of its divisors is an integer number (193597632).

Almost surely, 2^1161322143 is an apocalyptic number.

1161322143 is a deficient number, since it is larger than the sum of its proper divisors (387458913).

1161322143 is an equidigital number, since it uses as much as digits as its factorization.

1161322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87885.

The product of its digits is 864, while the sum is 24.

The square root of 1161322143 is about 34078.1769318724. The cubic root of 1161322143 is about 1051.1166180121.

Adding to 1161322143 its reverse (3412231611), we get a palindrome (4573553754).

The spelling of 1161322143 in words is "one billion, one hundred sixty-one million, three hundred twenty-two thousand, one hundred forty-three".