161816 has 16 divisors (see below), whose sum is σ = 307800. Its totient is φ = 79744.

The previous prime is 161807. The next prime is 161831. The reversal of 161816 is 618161.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 161791 and 161800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815 + ... + 993.

2¹⁶¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

161816 is a deficient number, since it is larger than the sum of its proper divisors (145984).

161816 is a wasteful number, since it uses less digits than its factorization.

161816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 294 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 161816 is about 402.2635951711. The cubic root of 161816 is about 54.4929710656.

Adding to 161816 its reverse (618161), we get a palindrome (779977).

The spelling of 161816 in words is "one hundred sixty-one thousand, eight hundred sixteen".