121000661 has 2 divisors, whose sum is σ = 121000662. Its totient is φ = 121000660.

The previous prime is 121000651. The next prime is 121000697. The reversal of 121000661 is 166000121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114083761 + 6916900 = 10681^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000661 - 2⁶ = 121000597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500330 + 60500331.

It is an arithmetic number, because the mean of its divisors is an integer number (60500331).

Almost surely, 2^121000661 is an apocalyptic number.

It is an amenable number.

121000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000661 is an equidigital number, since it uses as much as digits as its factorization.

121000661 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 17.

The square root of 121000661 is about 11000.0300454135. The cubic root of 121000661 is about 494.6096449744.

Adding to 121000661 its reverse (166000121), we get a palindrome (287000782).

The spelling of 121000661 in words is "one hundred twenty-one million, six hundred sixty-one", and thus it is an aban number.