161138112 has 28 divisors (see below), whose sum is σ = 426345096. Its totient is φ = 53712640.

The previous prime is 161138111. The next prime is 161138129. The reversal of 161138112 is 211831161.

It is a super-2 number, since 2×161138112² = 51930982277849088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 (161138111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419439 + ... + 419822.

Almost surely, 2^161138112 is an apocalyptic number.

161138112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161138112 is an abundant number, since it is smaller than the sum of its proper divisors (265206984).

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

161138112 is an equidigital number, since it uses as much as digits as its factorization.

161138112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839276 (or 839266 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The square root of 161138112 is about 12694.0187490014. The cubic root of 161138112 is about 544.1676962813.

Adding to 161138112 its reverse (211831161), we get a palindrome (372969273).

The spelling of 161138112 in words is "one hundred sixty-one million, one hundred thirty-eight thousand, one hundred twelve".