541845218921 has 2 divisors, whose sum is σ = 541845218922. Its totient is φ = 541845218920.

The previous prime is 541845218807. The next prime is 541845218939. The reversal of 541845218921 is 129812548145.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541291275625 + 553943296 = 735725^2 + 23536^2 .

It is a cyclic number.

It is not a de Polignac number, because 541845218921 - 2³⁴ = 524665349737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 541845218921.

It is not a weakly prime, because it can be changed into another prime (541845218521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270922609460 + 270922609461.

It is an arithmetic number, because the mean of its divisors is an integer number (270922609461).

Almost surely, 2^541845218921 is an apocalyptic number.

It is an amenable number.

541845218921 is a deficient number, since it is larger than the sum of its proper divisors (1).

541845218921 is an equidigital number, since it uses as much as digits as its factorization.

541845218921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 50.

The spelling of 541845218921 in words is "five hundred forty-one billion, eight hundred forty-five million, two hundred eighteen thousand, nine hundred twenty-one".