161516 has 12 divisors (see below), whose sum is σ = 285600. Its totient is φ = 79920.

The previous prime is 161507. The next prime is 161521. The reversal of 161516 is 615161.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (23800).

2¹⁶¹⁵¹⁶ is an apocalyptic number.

It is an amenable number.

161516 is a deficient number, since it is larger than the sum of its proper divisors (124084).

161516 is a wasteful number, since it uses less digits than its factorization.

161516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 422 counting only the distinct ones).

The product of its digits is 180, while the sum is 20.

The square root of 161516 is about 401.8905323592. The cubic root of 161516 is about 54.4592743473.

Adding to 161516 its reverse (615161), we get a palindrome (776677).

The spelling of 161516 in words is "one hundred sixty-one thousand, five hundred sixteen".