161512120 has 128 divisors (see below), whose sum is σ = 464486400. Its totient is φ = 49075200.

The previous prime is 161512111. The next prime is 161512133. The reversal of 161512120 is 21215161.

It is a congruent number.

It is an unprimeable number.

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, 125641 + ... + 126919.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^161512120 is an apocalyptic number.

161512120 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 161512120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232243200).

161512120 is an abundant number, since it is smaller than the sum of its proper divisors (302974280).

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

161512120 is a wasteful number, since it uses less digits than its factorization.

161512120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1345 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 161512120 is about 12708.7418732147. The cubic root of 161512120 is about 544.5883826317.

Adding to 161512120 its reverse (21215161), we get a palindrome (182727281).

The spelling of 161512120 in words is "one hundred sixty-one million, five hundred twelve thousand, one hundred twenty".