161611 has 2 divisors, whose sum is σ = 161612. Its totient is φ = 161610.

The previous prime is 161599. The next prime is 161627. The reversal of 161611 is 116161.

It is an a-pointer prime, because the next prime (161627) can be obtained adding 161611 to its sum of digits (16).

It is a weak prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 119191 and 191911.

It is a cyclic number.

It is not a de Polignac number, because 161611 - 2¹¹ = 159563 is a prime.

It is a super-2 number, since 2×161611² = 52236230642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161641) by changing a digit.

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 as a sum of consecutive naturals, namely, 80805 + 80806.

It is an arithmetic number, because the mean of its divisors is an integer number (80806).

2¹⁶¹⁶¹¹ is an apocalyptic number.

161611 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611 is an equidigital number, since it uses as much as digits as its factorization.

161611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 161611 is about 402.0087063734. The cubic root of 161611 is about 54.4699494859.

Adding to 161611 its reverse (116161), we get a palindrome (277772).

The spelling of 161611 in words is "one hundred sixty-one thousand, six hundred eleven".