541661 has 2 divisors, whose sum is σ = 541662. Its totient is φ = 541660.

The previous prime is 541657. The next prime is 541669. The reversal of 541661 is 166145.

541661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481636 + 60025 = 694^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 541661 - 2² = 541657 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 541661.

It is not a weakly prime, because it can be changed into another prime (541669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270830 + 270831.

It is an arithmetic number, because the mean of its divisors is an integer number (270831).

2⁵⁴¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

541661 is a deficient number, since it is larger than the sum of its proper divisors (1).

541661 is an equidigital number, since it uses as much as digits as its factorization.

541661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 541661 is about 735.9762224420. The cubic root of 541661 is about 81.5159365125.

The spelling of 541661 in words is "five hundred forty-one thousand, six hundred sixty-one".