121000261 has 2 divisors, whose sum is σ = 121000262. Its totient is φ = 121000260.

The previous prime is 121000213. The next prime is 121000283. The reversal of 121000261 is 162000121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90364036 + 30636225 = 9506^2 + 5535^2 .

It is an emirp because it is prime and its reverse (162000121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121000261 - 2⁷ = 121000133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500130 + 60500131.

It is an arithmetic number, because the mean of its divisors is an integer number (60500131).

Almost surely, 2^121000261 is an apocalyptic number.

It is an amenable number.

121000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000261 is an equidigital number, since it uses as much as digits as its factorization.

121000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121000261 is about 11000.0118636300. The cubic root of 121000261 is about 494.6090999524.

Adding to 121000261 its reverse (162000121), we get a palindrome (283000382).

The spelling of 121000261 in words is "one hundred twenty-one million, two hundred sixty-one", and thus it is an aban number.