19900000543 has 2 divisors, whose sum is σ = 19900000544. Its totient is φ = 19900000542.

The previous prime is 19900000529. The next prime is 19900000553. The reversal of 19900000543 is 34500000991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19900000543 - 2⁹ = 19900000031 is a prime.

It is a super-2 number, since 2×19900000543² (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 (19900000553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950000271 + 9950000272.

It is an arithmetic number, because the mean of its divisors is an integer number (9950000272).

Almost surely, 2^19900000543 is an apocalyptic number.

19900000543 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900000543 is an equidigital number, since it uses as much as digits as its factorization.

19900000543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The spelling of 19900000543 in words is "nineteen billion, nine hundred million, five hundred forty-three", and thus it is an aban number.