161331112 has 8 divisors (see below), whose sum is σ = 302495850. Its totient is φ = 80665552.

The previous prime is 161331103. The next prime is 161331133. The reversal of 161331112 is 211133161.

It can be written as a sum of positive squares in only one way, i.e., 138156516 + 23174596 = 11754^2 + 4814^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 161331112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083187 + ... + 10083202.

Almost surely, 2^161331112 is an apocalyptic number.

It is an amenable number.

161331112 is a deficient number, since it is larger than the sum of its proper divisors (141164738).

161331112 is a wasteful number, since it uses less digits than its factorization.

161331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20166395 (or 20166391 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

The square root of 161331112 is about 12701.6184795482. The cubic root of 161331112 is about 544.3848649814.

Adding to 161331112 its reverse (211133161), we get a palindrome (372464273).

The spelling of 161331112 in words is "one hundred sixty-one million, three hundred thirty-one thousand, one hundred twelve".