121744197569 has 2 divisors, whose sum is σ = 121744197570. Its totient is φ = 121744197568.

The previous prime is 121744197559. The next prime is 121744197581. The reversal of 121744197569 is 965791447121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113474659600 + 8269537969 = 336860^2 + 90937^2 .

It is a cyclic number.

It is not a de Polignac number, because 121744197569 - 2¹⁶ = 121744132033 is a prime.

It is a super-2 number, since 2×121744197569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121744197559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60872098784 + 60872098785.

It is an arithmetic number, because the mean of its divisors is an integer number (60872098785).

Almost surely, 2^121744197569 is an apocalyptic number.

It is an amenable number.

121744197569 is a deficient number, since it is larger than the sum of its proper divisors (1).

121744197569 is an equidigital number, since it uses as much as digits as its factorization.

121744197569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The spelling of 121744197569 in words is "one hundred twenty-one billion, seven hundred forty-four million, one hundred ninety-seven thousand, five hundred sixty-nine".