19900000247 has 2 divisors, whose sum is σ = 19900000248. Its totient is φ = 19900000246.

The previous prime is 19900000217. The next prime is 19900000279. The reversal of 19900000247 is 74200000991.

It is an a-pointer prime, because the next prime (19900000279) can be obtained adding 19900000247 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19900000247 - 2²⁰ = 19898951671 is a prime.

It is a super-2 number, since 2×19900000247² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900000217) 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, 9950000123 + 9950000124.

It is an arithmetic number, because the mean of its divisors is an integer number (9950000124).

Almost surely, 2^19900000247 is an apocalyptic number.

19900000247 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900000247 is an equidigital number, since it uses as much as digits as its factorization.

19900000247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 19900000247 in words is "nineteen billion, nine hundred million, two hundred forty-seven", and thus it is an aban number.