385204121 has 2 divisors, whose sum is σ = 385204122. Its totient is φ = 385204120.

The previous prime is 385204117. The next prime is 385204123. The reversal of 385204121 is 121402583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373880896 + 11323225 = 19336^2 + 3365^2 .

It is an emirp because it is prime and its reverse (121402583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385204121 - 2² = 385204117 is a prime.

Together with 385204123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (385204123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192602060 + 192602061.

It is an arithmetic number, because the mean of its divisors is an integer number (192602061).

Almost surely, 2^385204121 is an apocalyptic number.

It is an amenable number.

385204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

385204121 is an equidigital number, since it uses as much as digits as its factorization.

385204121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 385204121 is about 19626.6176658129. The cubic root of 385204121 is about 727.6071781096.

The spelling of 385204121 in words is "three hundred eighty-five million, two hundred four thousand, one hundred twenty-one".