19919041 has 2 divisors, whose sum is σ = 19919042. Its totient is φ = 19919040.

The previous prime is 19919017. The next prime is 19919051. The reversal of 19919041 is 14091991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 1256641 = 4320^2 + 1121^2 .

It is a cyclic number.

It is not a de Polignac number, because 19919041 - 2¹¹ = 19916993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19918988 and 19919006.

It is not a weakly prime, because it can be changed into another prime (19919051) 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, 9959520 + 9959521.

It is an arithmetic number, because the mean of its divisors is an integer number (9959521).

Almost surely, 2^19919041 is an apocalyptic number.

It is an amenable number.

19919041 is a deficient number, since it is larger than the sum of its proper divisors (1).

19919041 is an equidigital number, since it uses as much as digits as its factorization.

19919041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 19919041 is about 4463.0752850473. The cubic root of 19919041 is about 271.0750054501.

The spelling of 19919041 in words is "nineteen million, nine hundred nineteen thousand, forty-one".