381655213 has 2 divisors, whose sum is σ = 381655214. Its totient is φ = 381655212.

The previous prime is 381655207. The next prime is 381655277. The reversal of 381655213 is 312556183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 368716804 + 12938409 = 19202^2 + 3597^2 .

It is an emirp because it is prime and its reverse (312556183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381655213 - 2⁹ = 381654701 is a prime.

It is a super-2 number, since 2×381655213² = 291321403220150738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381655013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190827606 + 190827607.

It is an arithmetic number, because the mean of its divisors is an integer number (190827607).

Almost surely, 2^381655213 is an apocalyptic number.

It is an amenable number.

381655213 is a deficient number, since it is larger than the sum of its proper divisors (1).

381655213 is an equidigital number, since it uses as much as digits as its factorization.

381655213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 381655213 is about 19535.9978757165. The cubic root of 381655213 is about 725.3657848208.

The spelling of 381655213 in words is "three hundred eighty-one million, six hundred fifty-five thousand, two hundred thirteen".