381890569 has 2 divisors, whose sum is σ = 381890570. Its totient is φ = 381890568.

The previous prime is 381890549. The next prime is 381890573. The reversal of 381890569 is 965098183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342990400 + 38900169 = 18520^2 + 6237^2 .

It is a cyclic number.

It is not a de Polignac number, because 381890569 - 2¹³ = 381882377 is a prime.

It is a super-2 number, since 2×381890569² = 291680813382287522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (381890549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190945284 + 190945285.

It is an arithmetic number, because the mean of its divisors is an integer number (190945285).

Almost surely, 2^381890569 is an apocalyptic number.

It is an amenable number.

381890569 is a deficient number, since it is larger than the sum of its proper divisors (1).

381890569 is an equidigital number, since it uses as much as digits as its factorization.

381890569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 381890569 is about 19542.0205966527. The cubic root of 381890569 is about 725.5148583853.

The spelling of 381890569 in words is "three hundred eighty-one million, eight hundred ninety thousand, five hundred sixty-nine".