19261043987 has 2 divisors, whose sum is σ = 19261043988. Its totient is φ = 19261043986.

The previous prime is 19261043909. The next prime is 19261044037. The reversal of 19261043987 is 78934016291.

It is an a-pointer prime, because the next prime (19261044037) can be obtained adding 19261043987 to its sum of digits (50).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19261043987 - 2²² = 19256849683 is a prime.

It is not a weakly prime, because it can be changed into another prime (19261045987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9630521993 + 9630521994.

It is an arithmetic number, because the mean of its divisors is an integer number (9630521994).

Almost surely, 2^19261043987 is an apocalyptic number.

19261043987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19261043987 is an equidigital number, since it uses as much as digits as its factorization.

19261043987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 19261043987 in words is "nineteen billion, two hundred sixty-one million, forty-three thousand, nine hundred eighty-seven".