12022561 has 2 divisors, whose sum is σ = 12022562. Its totient is φ = 12022560.

The previous prime is 12022531. The next prime is 12022579. The reversal of 12022561 is 16522021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11350161 + 672400 = 3369^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 12022561 - 2⁷ = 12022433 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (12022511) 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, 6011280 + 6011281.

It is an arithmetic number, because the mean of its divisors is an integer number (6011281).

Almost surely, 2^12022561 is an apocalyptic number.

It is an amenable number.

12022561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12022561 is an equidigital number, since it uses as much as digits as its factorization.

12022561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12022561 is about 3467.3564858549. The cubic root of 12022561 is about 229.0862358994.

Adding to 12022561 its reverse (16522021), we get a palindrome (28544582).

The spelling of 12022561 in words is "twelve million, twenty-two thousand, five hundred sixty-one".