19699087 has 2 divisors, whose sum is σ = 19699088. Its totient is φ = 19699086.

The previous prime is 19699079. The next prime is 19699103. The reversal of 19699087 is 78099691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19699087 - 2³ = 19699079 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19699087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19699027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849543 + 9849544.

It is an arithmetic number, because the mean of its divisors is an integer number (9849544).

Almost surely, 2^19699087 is an apocalyptic number.

19699087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19699087 is an equidigital number, since it uses as much as digits as its factorization.

19699087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19699087 is about 4438.3653522440. The cubic root of 19699087 is about 270.0735373541.

The spelling of 19699087 in words is "nineteen million, six hundred ninety-nine thousand, eighty-seven".