161227612 has 48 divisors (see below), whose sum is σ = 348933312. Its totient is φ = 63475200.

The previous prime is 161227603. The next prime is 161227639. The reversal of 161227612 is 216722161.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83862 + ... + 85762.

It is an arithmetic number, because the mean of its divisors is an integer number (7269444).

Almost surely, 2^161227612 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 161227612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174466656).

161227612 is an abundant number, since it is smaller than the sum of its proper divisors (187705700).

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

161227612 is a wasteful number, since it uses less digits than its factorization.

161227612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158 (or 2156 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 161227612 is about 12697.5435419612. The cubic root of 161227612 is about 544.2684255957.

Adding to 161227612 its reverse (216722161), we get a palindrome (377949773).

The spelling of 161227612 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, six hundred twelve".