1820541608489 has 2 divisors, whose sum is σ = 1820541608490. Its totient is φ = 1820541608488.

The previous prime is 1820541608453. The next prime is 1820541608503. The reversal of 1820541608489 is 9848061450281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1717200576400 + 103341032089 = 1310420^2 + 321467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820541608489 - 2²⁴ = 1820524831273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820541608689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910270804244 + 910270804245.

It is an arithmetic number, because the mean of its divisors is an integer number (910270804245).

Almost surely, 2^{1820541608489} is an apocalyptic number.

It is an amenable number.

1820541608489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820541608489 is an equidigital number, since it uses as much as digits as its factorization.

1820541608489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 1820541608489 in words is "one trillion, eight hundred twenty billion, five hundred forty-one million, six hundred eight thousand, four hundred eighty-nine".