411661 has 4 divisors (see below), whose sum is σ = 413824. Its totient is φ = 409500.

The previous prime is 411641. The next prime is 411667. The reversal of 411661 is 166114.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 411661 - 2¹⁵ = 378893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (411667) by changing a digit.

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, 765 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (103456).

2⁴¹¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

411661 is a deficient number, since it is larger than the sum of its proper divisors (2163).

411661 is a wasteful number, since it uses less digits than its factorization.

411661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162.

The product of its digits is 144, while the sum is 19.

The square root of 411661 is about 641.6081358586. The cubic root of 411661 is about 74.3897743876.

Adding to 411661 its reverse (166114), we get a palindrome (577775).

The spelling of 411661 in words is "four hundred eleven thousand, six hundred sixty-one".