18819228541 has 2 divisors, whose sum is σ = 18819228542. Its totient is φ = 18819228540.

The previous prime is 18819228539. The next prime is 18819228551. The reversal of 18819228541 is 14582291881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14690652025 + 4128576516 = 121205^2 + 64254^2 .

It is a cyclic number.

It is not a de Polignac number, because 18819228541 - 2¹ = 18819228539 is a prime.

Together with 18819228539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18819228551) 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, 9409614270 + 9409614271.

It is an arithmetic number, because the mean of its divisors is an integer number (9409614271).

Almost surely, 2^18819228541 is an apocalyptic number.

It is an amenable number.

18819228541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18819228541 is an equidigital number, since it uses as much as digits as its factorization.

18819228541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 368640, while the sum is 49.

The spelling of 18819228541 in words is "eighteen billion, eight hundred nineteen million, two hundred twenty-eight thousand, five hundred forty-one".