19859149 has 2 divisors, whose sum is σ = 19859150. Its totient is φ = 19859148.

The previous prime is 19859137. The next prime is 19859159. The reversal of 19859149 is 94195891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 101124 = 4445^2 + 318^2 .

It is a cyclic number.

It is not a de Polignac number, because 19859149 - 2¹⁵ = 19826381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19859099 and 19859108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19859159) 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, 9929574 + 9929575.

It is an arithmetic number, because the mean of its divisors is an integer number (9929575).

Almost surely, 2^19859149 is an apocalyptic number.

It is an amenable number.

19859149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19859149 is an equidigital number, since it uses as much as digits as its factorization.

19859149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 46.

The square root of 19859149 is about 4456.3605105512. The cubic root of 19859149 is about 270.8030458491.

The spelling of 19859149 in words is "nineteen million, eight hundred fifty-nine thousand, one hundred forty-nine".