384885521 has 2 divisors, whose sum is σ = 384885522. Its totient is φ = 384885520.

The previous prime is 384885517. The next prime is 384885541. The reversal of 384885521 is 125588483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346890625 + 37994896 = 18625^2 + 6164^2 .

It is an emirp because it is prime and its reverse (125588483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 384885521 - 2² = 384885517 is a prime.

It is not a weakly prime, because it can be changed into another prime (384885511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192442760 + 192442761.

It is an arithmetic number, because the mean of its divisors is an integer number (192442761).

Almost surely, 2^384885521 is an apocalyptic number.

It is an amenable number.

384885521 is a deficient number, since it is larger than the sum of its proper divisors (1).

384885521 is an equidigital number, since it uses as much as digits as its factorization.

384885521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 307200, while the sum is 44.

The square root of 384885521 is about 19618.4994584193. The cubic root of 384885521 is about 727.4065229463.

The spelling of 384885521 in words is "three hundred eighty-four million, eight hundred eighty-five thousand, five hundred twenty-one".