19905133 has 2 divisors, whose sum is σ = 19905134. Its totient is φ = 19905132.

The previous prime is 19905121. The next prime is 19905139. The reversal of 19905133 is 33150991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 1225449 = 4322^2 + 1107^2 .

It is a cyclic number.

It is not a de Polignac number, because 19905133 - 2⁵ = 19905101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19905095 and 19905104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19905139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9952566 + 9952567.

It is an arithmetic number, because the mean of its divisors is an integer number (9952567).

Almost surely, 2^19905133 is an apocalyptic number.

It is an amenable number.

19905133 is a deficient number, since it is larger than the sum of its proper divisors (1).

19905133 is an equidigital number, since it uses as much as digits as its factorization.

19905133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 19905133 is about 4461.5168945102. The cubic root of 19905133 is about 271.0119001868.

The spelling of 19905133 in words is "nineteen million, nine hundred five thousand, one hundred thirty-three".