161132321 has 8 divisors (see below), whose sum is σ = 184438464. Its totient is φ = 137898000.

The previous prime is 161132297. The next prime is 161132329. The reversal of 161132321 is 123231161.

161132321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161132321 - 2¹⁰ = 161131297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161132293 and 161132302.

It is not an unprimeable number, because it can be changed into a prime (161132329) 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, 13055 + ... + 22196.

It is an arithmetic number, because the mean of its divisors is an integer number (23054808).

Almost surely, 2^161132321 is an apocalyptic number.

It is an amenable number.

161132321 is a deficient number, since it is larger than the sum of its proper divisors (23306143).

161132321 is an equidigital number, since it uses as much as digits as its factorization.

161132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35911.

The product of its digits is 216, while the sum is 20.

The square root of 161132321 is about 12693.7906473992. The cubic root of 161132321 is about 544.1611774161.

Adding to 161132321 its reverse (123231161), we get a palindrome (284363482).

The spelling of 161132321 in words is "one hundred sixty-one million, one hundred thirty-two thousand, three hundred twenty-one".