120116561 has 2 divisors, whose sum is σ = 120116562. Its totient is φ = 120116560.

The previous prime is 120116539. The next prime is 120116617. The reversal of 120116561 is 165611021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101626561 + 18490000 = 10081^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 120116561 - 2¹⁰ = 120115537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120115561) 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, 60058280 + 60058281.

It is an arithmetic number, because the mean of its divisors is an integer number (60058281).

Almost surely, 2^120116561 is an apocalyptic number.

It is an amenable number.

120116561 is a deficient number, since it is larger than the sum of its proper divisors (1).

120116561 is an equidigital number, since it uses as much as digits as its factorization.

120116561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 120116561 is about 10959.7701162023. The cubic root of 120116561 is about 493.4020654886.

Adding to 120116561 its reverse (165611021), we get a palindrome (285727582).

The spelling of 120116561 in words is "one hundred twenty million, one hundred sixteen thousand, five hundred sixty-one".