19939469287 has 2 divisors, whose sum is σ = 19939469288. Its totient is φ = 19939469286.

The previous prime is 19939469243. The next prime is 19939469317. The reversal of 19939469287 is 78296493991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19939469287 - 2⁷ = 19939469159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19939469087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9969734643 + 9969734644.

It is an arithmetic number, because the mean of its divisors is an integer number (9969734644).

Almost surely, 2^19939469287 is an apocalyptic number.

19939469287 is a deficient number, since it is larger than the sum of its proper divisors (1).

19939469287 is an equidigital number, since it uses as much as digits as its factorization.

19939469287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52907904, while the sum is 67.

The spelling of 19939469287 in words is "nineteen billion, nine hundred thirty-nine million, four hundred sixty-nine thousand, two hundred eighty-seven".