19719061 has 2 divisors, whose sum is σ = 19719062. Its totient is φ = 19719060.

The previous prime is 19719047. The next prime is 19719071. The reversal of 19719061 is 16091791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14516100 + 5202961 = 3810^2 + 2281^2 .

It is a cyclic number.

It is not a de Polignac number, because 19719061 - 2⁹ = 19718549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19719001) 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, 9859530 + 9859531.

It is an arithmetic number, because the mean of its divisors is an integer number (9859531).

Almost surely, 2^19719061 is an apocalyptic number.

It is an amenable number.

19719061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19719061 is an equidigital number, since it uses as much as digits as its factorization.

19719061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 34.

The square root of 19719061 is about 4440.6149348936. The cubic root of 19719061 is about 270.1647873803.

The spelling of 19719061 in words is "nineteen million, seven hundred nineteen thousand, sixty-one".