161409132 has 96 divisors (see below), whose sum is σ = 432633600. Its totient is φ = 52016256.

The previous prime is 161409121. The next prime is 161409197. The reversal of 161409132 is 231904161.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 161409096 and 161409105.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 464983 + ... + 465329.

It is an arithmetic number, because the mean of its divisors is an integer number (4506600).

Almost surely, 2^161409132 is an apocalyptic number.

161409132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161409132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216316800).

161409132 is an abundant number, since it is smaller than the sum of its proper divisors (271224468).

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

161409132 is a wasteful number, since it uses less digits than its factorization.

161409132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161409132 is about 12704.6893704647. The cubic root of 161409132 is about 544.4726059877.

The spelling of 161409132 in words is "one hundred sixty-one million, four hundred nine thousand, one hundred thirty-two".