19881000959 has 2 divisors, whose sum is σ = 19881000960. Its totient is φ = 19881000958.

The previous prime is 19881000907. The next prime is 19881001037. The reversal of 19881000959 is 95900018891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19881000959 - 2⁸ = 19881000703 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881030959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940500479 + 9940500480.

It is an arithmetic number, because the mean of its divisors is an integer number (9940500480).

Almost surely, 2^19881000959 is an apocalyptic number.

19881000959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881000959 is an equidigital number, since it uses as much as digits as its factorization.

19881000959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 50.

The spelling of 19881000959 in words is "nineteen billion, eight hundred eighty-one million, nine hundred fifty-nine", and thus it is an aban number.