384145231621 has 2 divisors, whose sum is σ = 384145231622. Its totient is φ = 384145231620.

The previous prime is 384145231597. The next prime is 384145231703. The reversal of 384145231621 is 126132541483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261848147521 + 122297084100 = 511711^2 + 349710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384145231621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384145231721) 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, 192072615810 + 192072615811.

It is an arithmetic number, because the mean of its divisors is an integer number (192072615811).

Almost surely, 2^384145231621 is an apocalyptic number.

It is an amenable number.

384145231621 is a deficient number, since it is larger than the sum of its proper divisors (1).

384145231621 is an equidigital number, since it uses as much as digits as its factorization.

384145231621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The spelling of 384145231621 in words is "three hundred eighty-four billion, one hundred forty-five million, two hundred thirty-one thousand, six hundred twenty-one".