121980611 has 2 divisors, whose sum is σ = 121980612. Its totient is φ = 121980610.

The previous prime is 121980587. The next prime is 121980643. The reversal of 121980611 is 116089121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121980611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121980011) 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, 60990305 + 60990306.

It is an arithmetic number, because the mean of its divisors is an integer number (60990306).

Almost surely, 2^121980611 is an apocalyptic number.

121980611 is a deficient number, since it is larger than the sum of its proper divisors (1).

121980611 is an equidigital number, since it uses as much as digits as its factorization.

121980611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 121980611 is about 11044.4832835221. The cubic root of 121980611 is about 495.9412909071.

The spelling of 121980611 in words is "one hundred twenty-one million, nine hundred eighty thousand, six hundred eleven".