19390000087 has 2 divisors, whose sum is σ = 19390000088. Its totient is φ = 19390000086.

The previous prime is 19390000067. The next prime is 19390000093. The reversal of 19390000087 is 78000009391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19390000087 - 2³¹ = 17242516439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19390000027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9695000043 + 9695000044.

It is an arithmetic number, because the mean of its divisors is an integer number (9695000044).

Almost surely, 2^19390000087 is an apocalyptic number.

19390000087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19390000087 is an equidigital number, since it uses as much as digits as its factorization.

19390000087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 19390000087 in words is "nineteen billion, three hundred ninety million, eighty-seven", and thus it is an aban number.