161305326 has 192 divisors, whose sum is σ = 465454080. Its totient is φ = 39191040.

The previous prime is 161305321. The next prime is 161305327. The reversal of 161305326 is 623503161.

It is a self number, because there is not a number n which added to its sum of digits gives 161305326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161305321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2209626 + ... + 2209698.

It is an arithmetic number, because the mean of its divisors is an integer number (2424240).

Almost surely, 2^161305326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161305326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232727040).

161305326 is an abundant number, since it is smaller than the sum of its proper divisors (304148754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161305326 is a wasteful number, since it uses less digits than its factorization.

161305326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 161305326 is about 12700.6033714938. The cubic root of 161305326 is about 544.3558599207.

Adding to 161305326 its reverse (623503161), we get a palindrome (784808487).

The spelling of 161305326 in words is "one hundred sixty-one million, three hundred five thousand, three hundred twenty-six".