381820213 has 2 divisors, whose sum is σ = 381820214. Its totient is φ = 381820212.

The previous prime is 381820207. The next prime is 381820223. The reversal of 381820213 is 312028183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335878929 + 45941284 = 18327^2 + 6778^2 .

It is a cyclic number.

It is not a de Polignac number, because 381820213 - 2¹⁷ = 381689141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381820223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190910106 + 190910107.

It is an arithmetic number, because the mean of its divisors is an integer number (190910107).

Almost surely, 2^381820213 is an apocalyptic number.

It is an amenable number.

381820213 is a deficient number, since it is larger than the sum of its proper divisors (1).

381820213 is an equidigital number, since it uses as much as digits as its factorization.

381820213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 381820213 is about 19540.2203928205. The cubic root of 381820213 is about 725.4703015912.

Adding to 381820213 its reverse (312028183), we get a palindrome (693848396).

The spelling of 381820213 in words is "three hundred eighty-one million, eight hundred twenty thousand, two hundred thirteen".