19543552541 has 2 divisors, whose sum is σ = 19543552542. Its totient is φ = 19543552540.

The previous prime is 19543552517. The next prime is 19543552543. The reversal of 19543552541 is 14525534591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17363596441 + 2179956100 = 131771^2 + 46690^2 .

It is an emirp because it is prime and its reverse (14525534591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19543552541 is a prime.

It is a super-3 number, since 3×19543552541³ (a number of 32 digits) contains 333 as substring.

Together with 19543552543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19543552492 and 19543552501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19543552543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9771776270 + 9771776271.

It is an arithmetic number, because the mean of its divisors is an integer number (9771776271).

Almost surely, 2^19543552541 is an apocalyptic number.

It is an amenable number.

19543552541 is a deficient number, since it is larger than the sum of its proper divisors (1).

19543552541 is an equidigital number, since it uses as much as digits as its factorization.

19543552541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540000, while the sum is 44.

The spelling of 19543552541 in words is "nineteen billion, five hundred forty-three million, five hundred fifty-two thousand, five hundred forty-one".