384624221 has 2 divisors, whose sum is σ = 384624222. Its totient is φ = 384624220.

The previous prime is 384624217. The next prime is 384624283. The reversal of 384624221 is 122426483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310147321 + 74476900 = 17611^2 + 8630^2 .

It is an emirp because it is prime and its reverse (122426483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 384624221 - 2² = 384624217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384624521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192312110 + 192312111.

It is an arithmetic number, because the mean of its divisors is an integer number (192312111).

Almost surely, 2^384624221 is an apocalyptic number.

It is an amenable number.

384624221 is a deficient number, since it is larger than the sum of its proper divisors (1).

384624221 is an equidigital number, since it uses as much as digits as its factorization.

384624221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 32.

The square root of 384624221 is about 19611.8387970124. The cubic root of 384624221 is about 727.2418728155.

The spelling of 384624221 in words is "three hundred eighty-four million, six hundred twenty-four thousand, two hundred twenty-one".