381766369 has 2 divisors, whose sum is σ = 381766370. Its totient is φ = 381766368.

The previous prime is 381766349. The next prime is 381766417. The reversal of 381766369 is 963667183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224640144 + 157126225 = 14988^2 + 12535^2 .

It is a cyclic number.

It is not a de Polignac number, because 381766369 - 2⁷ = 381766241 is a prime.

It is a super-2 number, since 2×381766369² = 291491120998888322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381766339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190883184 + 190883185.

It is an arithmetic number, because the mean of its divisors is an integer number (190883185).

Almost surely, 2^381766369 is an apocalyptic number.

It is an amenable number.

381766369 is a deficient number, since it is larger than the sum of its proper divisors (1).

381766369 is an equidigital number, since it uses as much as digits as its factorization.

381766369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 381766369 is about 19538.8425706335. The cubic root of 381766369 is about 725.4361982289.

The spelling of 381766369 in words is "three hundred eighty-one million, seven hundred sixty-six thousand, three hundred sixty-nine".