161810 has 16 divisors (see below), whose sum is σ = 317952. Its totient is φ = 58800.

The previous prime is 161807. The next prime is 161831. The reversal of 161810 is 18161.

It is a happy number.

It is a super-2 number, since 2×161810² = 52364952200, which contains 22 as substring.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161810.

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 7 ways as a sum of consecutive naturals, for example, 626 + ... + 845.

It is an arithmetic number, because the mean of its divisors is an integer number (19872).

2¹⁶¹⁸¹⁰ is an apocalyptic number.

161810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161810 is a deficient number, since it is larger than the sum of its proper divisors (156142).

161810 is a wasteful number, since it uses less digits than its factorization.

161810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 161810 is about 402.2561373056. The cubic root of 161810 is about 54.4922975395.

Adding to 161810 its reverse (18161), we get a palindrome (179971).

The spelling of 161810 in words is "one hundred sixty-one thousand, eight hundred ten".