385845221 has 2 divisors, whose sum is σ = 385845222. Its totient is φ = 385845220.

The previous prime is 385845199. The next prime is 385845233. The reversal of 385845221 is 122548583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315453121 + 70392100 = 17761^2 + 8390^2 .

It is a cyclic number.

It is not a de Polignac number, because 385845221 - 2⁶ = 385845157 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 (385842221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192922610 + 192922611.

It is an arithmetic number, because the mean of its divisors is an integer number (192922611).

Almost surely, 2^385845221 is an apocalyptic number.

It is an amenable number.

385845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

385845221 is an equidigital number, since it uses as much as digits as its factorization.

385845221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 38.

The square root of 385845221 is about 19642.9432876033. The cubic root of 385845221 is about 728.0106095996.

The spelling of 385845221 in words is "three hundred eighty-five million, eight hundred forty-five thousand, two hundred twenty-one".