381986543 has 2 divisors, whose sum is σ = 381986544. Its totient is φ = 381986542.

The previous prime is 381986533. The next prime is 381986581. The reversal of 381986543 is 345689183.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381986543 is a prime.

It is a super-3 number, since 3×381986543³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381986503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190993271 + 190993272.

It is an arithmetic number, because the mean of its divisors is an integer number (190993272).

Almost surely, 2^381986543 is an apocalyptic number.

381986543 is a deficient number, since it is larger than the sum of its proper divisors (1).

381986543 is an equidigital number, since it uses as much as digits as its factorization.

381986543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 47.

The square root of 381986543 is about 19544.4760226515. The cubic root of 381986543 is about 725.5756303590.

The spelling of 381986543 in words is "three hundred eighty-one million, nine hundred eighty-six thousand, five hundred forty-three".