661411 has 8 divisors (see below), whose sum is σ = 698400. Its totient is φ = 625152.

The previous prime is 661393. The next prime is 661417. The reversal of 661411 is 114166.

It is a happy number.

661411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661411 - 2⁹ = 660899 is a prime.

It is a Duffinian number.

661411 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (661417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3331 + ... + 3523.

It is an arithmetic number, because the mean of its divisors is an integer number (87300).

2⁶⁶¹⁴¹¹ is an apocalyptic number.

661411 is a deficient number, since it is larger than the sum of its proper divisors (36989).

661411 is a wasteful number, since it uses less digits than its factorization.

661411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

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

The square root of 661411 is about 813.2717872888. The cubic root of 661411 is about 87.1278781794.

Adding to 661411 its reverse (114166), we get a palindrome (775577).

The spelling of 661411 in words is "six hundred sixty-one thousand, four hundred eleven".