161036520 has 128 divisors (see below), whose sum is σ = 502951680. Its totient is φ = 41216000.

The previous prime is 161036503. The next prime is 161036539. The reversal of 161036520 is 25630161.

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

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, 349090 + ... + 349550.

It is an arithmetic number, because the mean of its divisors is an integer number (3929310).

Almost surely, 2^161036520 is an apocalyptic number.

161036520 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 161036520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251475840).

161036520 is an abundant number, since it is smaller than the sum of its proper divisors (341915160).

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

161036520 is a wasteful number, since it uses less digits than its factorization.

161036520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 161036520 is about 12690.0165484526. The cubic root of 161036520 is about 544.0533126096.

Adding to 161036520 its reverse (25630161), we get a palindrome (186666681).

The spelling of 161036520 in words is "one hundred sixty-one million, thirty-six thousand, five hundred twenty".