161530 has 16 divisors (see below), whose sum is σ = 301320. Its totient is φ = 62272.

The previous prime is 161527. The next prime is 161531. The reversal of 161530 is 35161.

It can be written as a sum of positive squares in 4 ways, for example, as 95481 + 66049 = 309^2 + 257^2 .

It is not an unprimeable number, because it can be changed into a prime (161531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12 + ... + 568.

2¹⁶¹⁵³⁰ is an apocalyptic number.

161530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161530 is a deficient number, since it is larger than the sum of its proper divisors (139790).

161530 is a wasteful number, since it uses less digits than its factorization.

161530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 161530 is about 401.9079496601. The cubic root of 161530 is about 54.4608477885.

Adding to 161530 its reverse (35161), we get a palindrome (196691).

The spelling of 161530 in words is "one hundred sixty-one thousand, five hundred thirty".