161401128 has 128 divisors (see below), whose sum is σ = 504299520. Its totient is φ = 41978880.

The previous prime is 161401117. The next prime is 161401129. The reversal of 161401128 is 821104161.

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

It is a junction number, because it is equal to n+sod(n) for n = 161401098 and 161401107.

It is not an unprimeable number, because it can be changed into a prime (161401129) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 87625 + ... + 89447.

It is an arithmetic number, because the mean of its divisors is an integer number (3939840).

Almost surely, 2^161401128 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 161401128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252149760).

161401128 is an abundant number, since it is smaller than the sum of its proper divisors (342898392).

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

161401128 is a wasteful number, since it uses less digits than its factorization.

161401128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887 (or 1883 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 161401128 is about 12704.3743647611. The cubic root of 161401128 is about 544.4636060203.

Adding to 161401128 its reverse (821104161), we get a palindrome (982505289).

The spelling of 161401128 in words is "one hundred sixty-one million, four hundred one thousand, one hundred twenty-eight".