19961289203 has 2 divisors, whose sum is σ = 19961289204. Its totient is φ = 19961289202.

The previous prime is 19961289149. The next prime is 19961289221. The reversal of 19961289203 is 30298216991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19961289203 - 2²⁴ = 19944511987 is a prime.

It is not a weakly prime, because it can be changed into another prime (19961283203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9980644601 + 9980644602.

It is an arithmetic number, because the mean of its divisors is an integer number (9980644602).

Almost surely, 2^19961289203 is an apocalyptic number.

19961289203 is a deficient number, since it is larger than the sum of its proper divisors (1).

19961289203 is an equidigital number, since it uses as much as digits as its factorization.

19961289203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 19961289203 in words is "nineteen billion, nine hundred sixty-one million, two hundred eighty-nine thousand, two hundred three".