120661 has 2 divisors, whose sum is σ = 120662. Its totient is φ = 120660.

The previous prime is 120647. The next prime is 120671. The reversal of 120661 is 166021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86436 + 34225 = 294^2 + 185^2 .

It is an emirp because it is prime and its reverse (166021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60330 + 60331.

It is an arithmetic number, because the mean of its divisors is an integer number (60331).

2¹²⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

120661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120661 is an equidigital number, since it uses as much as digits as its factorization.

120661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 120661 is about 347.3629226040. The cubic root of 120661 is about 49.4146404944.

Adding to 120661 its reverse (166021), we get a palindrome (286682).

The spelling of 120661 in words is "one hundred twenty thousand, six hundred sixty-one".