161523120 has 320 divisors, whose sum is σ = 597818880. Its totient is φ = 35635200.

The previous prime is 161523107. The next prime is 161523121. The reversal of 161523120 is 21325161.

It is not an unprimeable number, because it can be changed into a prime (161523121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2647890 + ... + 2647950.

It is an arithmetic number, because the mean of its divisors is an integer number (1868184).

Almost surely, 2^161523120 is an apocalyptic number.

161523120 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 161523120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298909440).

161523120 is an abundant number, since it is smaller than the sum of its proper divisors (436295760).

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

161523120 is a wasteful number, since it uses less digits than its factorization.

161523120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 161523120 is about 12709.1746388190. The cubic root of 161523120 is about 544.6007456590.

Adding to 161523120 its reverse (21325161), we get a palindrome (182848281).

The spelling of 161523120 in words is "one hundred sixty-one million, five hundred twenty-three thousand, one hundred twenty".