161530530 has 64 divisors (see below), whose sum is σ = 455051520. Its totient is φ = 35921664.

The previous prime is 161530519. The next prime is 161530547. The reversal of 161530530 is 35035161.

It is a super-2 number, since 2×161530530² = 52184224244161800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161530530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2625 + ... + 18164.

It is an arithmetic number, because the mean of its divisors is an integer number (7110180).

Almost surely, 2^161530530 is an apocalyptic number.

161530530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161530530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227525760).

161530530 is an abundant number, since it is smaller than the sum of its proper divisors (293520990).

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

161530530 is a wasteful number, since it uses less digits than its factorization.

161530530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20843.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 161530530 is about 12709.4661571602. The cubic root of 161530530 is about 544.6090735273.

Adding to 161530530 its reverse (35035161), we get a palindrome (196565691).

The spelling of 161530530 in words is "one hundred sixty-one million, five hundred thirty thousand, five hundred thirty".