19066561 has 2 divisors, whose sum is σ = 19066562. Its totient is φ = 19066560.

The previous prime is 19066549. The next prime is 19066577. The reversal of 19066561 is 16566091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18326961 + 739600 = 4281^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 19066561 - 2⁵ = 19066529 is a prime.

It is equal to p_1214989 and since 19066561 and 1214989 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (19066361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9533280 + 9533281.

It is an arithmetic number, because the mean of its divisors is an integer number (9533281).

Almost surely, 2^19066561 is an apocalyptic number.

It is an amenable number.

19066561 is a deficient number, since it is larger than the sum of its proper divisors (1).

19066561 is an equidigital number, since it uses as much as digits as its factorization.

19066561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 19066561 is about 4366.5273387441. The cubic root of 19066561 is about 267.1514008044.

The spelling of 19066561 in words is "nineteen million, sixty-six thousand, five hundred sixty-one".