18322861 has 2 divisors, whose sum is σ = 18322862. Its totient is φ = 18322860.

The previous prime is 18322853. The next prime is 18322873. The reversal of 18322861 is 16822381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 6728836 = 3405^2 + 2594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18322861 - 2³ = 18322853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18322561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9161430 + 9161431.

It is an arithmetic number, because the mean of its divisors is an integer number (9161431).

Almost surely, 2^18322861 is an apocalyptic number.

It is an amenable number.

18322861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18322861 is an equidigital number, since it uses as much as digits as its factorization.

18322861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 18322861 is about 4280.5211131356. The cubic root of 18322861 is about 263.6317802360.

The spelling of 18322861 in words is "eighteen million, three hundred twenty-two thousand, eight hundred sixty-one".