122236561 has 2 divisors, whose sum is σ = 122236562. Its totient is φ = 122236560.

The previous prime is 122236523. The next prime is 122236591. The reversal of 122236561 is 165632221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93238336 + 28998225 = 9656^2 + 5385^2 .

It is a cyclic number.

It is not a de Polignac number, because 122236561 - 2¹¹ = 122234513 is a prime.

It is not a weakly prime, because it can be changed into another prime (122236501) 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, 61118280 + 61118281.

It is an arithmetic number, because the mean of its divisors is an integer number (61118281).

Almost surely, 2^122236561 is an apocalyptic number.

It is an amenable number.

122236561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122236561 is an equidigital number, since it uses as much as digits as its factorization.

122236561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 122236561 is about 11056.0644444576. The cubic root of 122236561 is about 496.2879238487.

Adding to 122236561 its reverse (165632221), we get a palindrome (287868782).

The spelling of 122236561 in words is "one hundred twenty-two million, two hundred thirty-six thousand, five hundred sixty-one".