18322561 has 2 divisors, whose sum is σ = 18322562. Its totient is φ = 18322560.

The previous prime is 18322553. The next prime is 18322571. The reversal of 18322561 is 16522381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 2073600 = 4031^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 18322561 - 2³ = 18322553 is a prime.

It is not a weakly prime, because it can be changed into another prime (18322571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9161280 + 9161281.

It is an arithmetic number, because the mean of its divisors is an integer number (9161281).

Almost surely, 2^18322561 is an apocalyptic number.

It is an amenable number.

18322561 is a deficient number, since it is larger than the sum of its proper divisors (1).

18322561 is an equidigital number, since it uses as much as digits as its factorization.

18322561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 18322561 is about 4280.4860705298. The cubic root of 18322561 is about 263.6303414147.

The spelling of 18322561 in words is "eighteen million, three hundred twenty-two thousand, five hundred sixty-one".