384181804621 has 2 divisors, whose sum is σ = 384181804622. Its totient is φ = 384181804620.

The previous prime is 384181804619. The next prime is 384181804663. The reversal of 384181804621 is 126408181483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262599878025 + 121581926596 = 512445^2 + 348686^2 .

It is a cyclic number.

It is not a de Polignac number, because 384181804621 - 2¹ = 384181804619 is a prime.

Together with 384181804619, 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 (384181804421) 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, 192090902310 + 192090902311.

It is an arithmetic number, because the mean of its divisors is an integer number (192090902311).

Almost surely, 2^384181804621 is an apocalyptic number.

It is an amenable number.

384181804621 is a deficient number, since it is larger than the sum of its proper divisors (1).

384181804621 is an equidigital number, since it uses as much as digits as its factorization.

384181804621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 384181804621 in words is "three hundred eighty-four billion, one hundred eighty-one million, eight hundred four thousand, six hundred twenty-one".