161508 has 24 divisors (see below), whose sum is σ = 386848. Its totient is φ = 52416.

The previous prime is 161507. The next prime is 161521. The reversal of 161508 is 805161.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (161503) 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, 360 + ... + 672.

2¹⁶¹⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

161508 is an abundant number, since it is smaller than the sum of its proper divisors (225340).

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

161508 is a wasteful number, since it uses less digits than its factorization.

161508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 161508 is about 401.8805792770. The cubic root of 161508 is about 54.4583751972.

Adding to 161508 its reverse (805161), we get a palindrome (966669).

The spelling of 161508 in words is "one hundred sixty-one thousand, five hundred eight".