1161322161 has 8 divisors (see below), whose sum is σ = 1629925920. Its totient is φ = 733466592.

The previous prime is 1161322147. The next prime is 1161322231. The reversal of 1161322161 is 1612231611.

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 1161322161 - 2¹⁷ = 1161191089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161322861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10186980 + ... + 10187093.

It is an arithmetic number, because the mean of its divisors is an integer number (203740740).

Almost surely, 2^1161322161 is an apocalyptic number.

It is an amenable number.

1161322161 is a deficient number, since it is larger than the sum of its proper divisors (468603759).

1161322161 is a wasteful number, since it uses less digits than its factorization.

1161322161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20374095.

The product of its digits is 432, while the sum is 24.

The square root of 1161322161 is about 34078.1771959710. The cubic root of 1161322161 is about 1051.1166234427.

Adding to 1161322161 its reverse (1612231611), we get a palindrome (2773553772).

The spelling of 1161322161 in words is "one billion, one hundred sixty-one million, three hundred twenty-two thousand, one hundred sixty-one".