161121128 has 32 divisors (see below), whose sum is σ = 347276160. Its totient is φ = 68648640.

The previous prime is 161121127. The next prime is 161121139. The reversal of 161121128 is 821121161.

161121128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161121127) 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, 1373 + ... + 18003.

It is an arithmetic number, because the mean of its divisors is an integer number (10852380).

Almost surely, 2^161121128 is an apocalyptic number.

It is an amenable number.

161121128 is an abundant number, since it is smaller than the sum of its proper divisors (186155032).

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

161121128 is a wasteful number, since it uses less digits than its factorization.

161121128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16817 (or 16813 counting only the distinct ones).

The product of its digits is 192, while the sum is 23.

The square root of 161121128 is about 12693.3497548913. The cubic root of 161121128 is about 544.1485771361.

Adding to 161121128 its reverse (821121161), we get a palindrome (982242289).

The spelling of 161121128 in words is "one hundred sixty-one million, one hundred twenty-one thousand, one hundred twenty-eight".