121952561 has 2 divisors, whose sum is σ = 121952562. Its totient is φ = 121952560.

The previous prime is 121952539. The next prime is 121952581. The reversal of 121952561 is 165259121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76457536 + 45495025 = 8744^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 121952561 - 2⁶ = 121952497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121952581) 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, 60976280 + 60976281.

It is an arithmetic number, because the mean of its divisors is an integer number (60976281).

Almost surely, 2^121952561 is an apocalyptic number.

It is an amenable number.

121952561 is a deficient number, since it is larger than the sum of its proper divisors (1).

121952561 is an equidigital number, since it uses as much as digits as its factorization.

121952561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 32.

The square root of 121952561 is about 11043.2133457613. The cubic root of 121952561 is about 495.9032733360.

The spelling of 121952561 in words is "one hundred twenty-one million, nine hundred fifty-two thousand, five hundred sixty-one".