121308981457 has 2 divisors, whose sum is σ = 121308981458. Its totient is φ = 121308981456.

The previous prime is 121308981377. The next prime is 121308981461. The reversal of 121308981457 is 754189803121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93568080321 + 27740901136 = 305889^2 + 166556^2 .

It is a cyclic number.

It is not a de Polignac number, because 121308981457 - 2¹¹ = 121308979409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121308981457.

It is not a weakly prime, because it can be changed into another prime (121308981467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60654490728 + 60654490729.

It is an arithmetic number, because the mean of its divisors is an integer number (60654490729).

Almost surely, 2^121308981457 is an apocalyptic number.

It is an amenable number.

121308981457 is a deficient number, since it is larger than the sum of its proper divisors (1).

121308981457 is an equidigital number, since it uses as much as digits as its factorization.

121308981457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 121308981457 in words is "one hundred twenty-one billion, three hundred eight million, nine hundred eighty-one thousand, four hundred fifty-seven".