161216132 has 48 divisors (see below), whose sum is σ = 353662848. Its totient is φ = 62469120.

The previous prime is 161216119. The next prime is 161216149. The reversal of 161216132 is 231612161.

It is a junction number, because it is equal to n+sod(n) for n = 161216098 and 161216107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59348 + ... + 62004.

It is an arithmetic number, because the mean of its divisors is an integer number (7367976).

Almost surely, 2^161216132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161216132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176831424).

161216132 is an abundant number, since it is smaller than the sum of its proper divisors (192446716).

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

161216132 is a wasteful number, since it uses less digits than its factorization.

161216132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876 (or 2874 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 161216132 is about 12697.0914779724. The cubic root of 161216132 is about 544.2555073167.

Adding to 161216132 its reverse (231612161), we get a palindrome (392828293).

The spelling of 161216132 in words is "one hundred sixty-one million, two hundred sixteen thousand, one hundred thirty-two".