161120520 has 384 divisors, whose sum is σ = 626745600. Its totient is φ = 35481600.

The previous prime is 161120503. The next prime is 161120521. The reversal of 161120520 is 25021161.

161120520 is a `hidden beast` number, since 1 + 611 + 2 + 0 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 161120493 and 161120502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161120521) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2641290 + ... + 2641350.

It is an arithmetic number, because the mean of its divisors is an integer number (1632150).

Almost surely, 2^161120520 is an apocalyptic number.

161120520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161120520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313372800).

161120520 is an abundant number, since it is smaller than the sum of its proper divisors (465625080).

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

161120520 is a wasteful number, since it uses less digits than its factorization.

161120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161120520 is about 12693.3258053199. The cubic root of 161120520 is about 544.1478926764.

Adding to 161120520 its reverse (25021161), we get a palindrome (186141681).

The spelling of 161120520 in words is "one hundred sixty-one million, one hundred twenty thousand, five hundred twenty".