18161112 has 32 divisors (see below), whose sum is σ = 47793600. Its totient is φ = 5734944.

The previous prime is 18161111. The next prime is 18161119. The reversal of 18161112 is 21116181.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19458 + ... + 20369.

It is an arithmetic number, because the mean of its divisors is an integer number (1493550).

Almost surely, 2^18161112 is an apocalyptic number.

18161112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18161112 is an abundant number, since it is smaller than the sum of its proper divisors (29632488).

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

18161112 is a wasteful number, since it uses less digits than its factorization.

18161112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39855 (or 39851 counting only the distinct ones).

The product of its digits is 96, while the sum is 21.

The square root of 18161112 is about 4261.5856204000. The cubic root of 18161112 is about 262.8537308271.

Adding to 18161112 its reverse (21116181), we get a palindrome (39277293).

The spelling of 18161112 in words is "eighteen million, one hundred sixty-one thousand, one hundred twelve".